Download Android AOT tools to the artifacts cache and build APKs using these tools (#3649)

Also update the engine to a build where these tools have been uplaoded

bin/cache/engine.version

-6e3228cf81e6fcb6bfd2ad1983fb8949dd7cc88b
+76d5cf230adb6a650022d87d8c76c3fe7fa97c09

packages/flutter_tools/lib/src/build_configuration.dart

@@ -24,6 +24,11 @@ enum BuildMode {
 
 String getModeName(BuildMode mode) => getEnumName(mode);
 
+// Returns true if the selected build mode uses ahead-of-time compilation.
+bool isAotBuildMode(BuildMode mode) {
+  return mode == BuildMode.profile || mode == BuildMode.release;
+}
+
 enum HostPlatform {
   darwin_x64,
   linux_x64,

packages/flutter_tools/lib/src/cache.dart

@@ -190,6 +190,7 @@ class FlutterEngine {
   List<String> _getEngineDirs() {
     List<String> dirs = <String>[
       'android-arm',
+      'android-arm-profile',
       'android-arm-release',
       'android-x64'
     ];
@@ -202,13 +203,18 @@ class FlutterEngine {
     return dirs;
   }
 
-  List<String> _getToolsDirs() {
+  // Return a list of (cache directory path, download URL path) tuples.
+  List<List<String>> _getToolsDirs() {
     if (Platform.isMacOS)
-      return <String>['darwin-x64'];
+      return <List<String>>[['darwin-x64', 'darwin-x64/artifacts.zip']];
     else if (Platform.isLinux)
-      return <String>['linux-x64'];
+      return <List<String>>[
+        ['linux-x64', 'linux-x64/artifacts.zip'],
+        ['android-arm-profile/linux-x64', 'android-arm-profile/linux-x64.zip'],
+        ['android-arm-release/linux-x64', 'android-arm-release/linux-x64.zip'],
+      ];
     else
-      return <String>[];
+      return <List<String>>[];
   }
 
   bool isUpToDate() {
@@ -226,8 +232,8 @@ class FlutterEngine {
         return false;
     }
 
-    for (String dirName in _getToolsDirs()) {
-      Directory dir = new Directory(path.join(engineDir.path, dirName));
+    for (List<String> toolsDir in _getToolsDirs()) {
+      Directory dir = new Directory(path.join(engineDir.path, toolsDir[0]));
       if (!dir.existsSync())
         return false;
     }
@@ -259,11 +265,13 @@ class FlutterEngine {
       }
     }
 
-    for (String dirName in _getToolsDirs()) {
-      Directory dir = new Directory(path.join(engineDir.path, dirName));
+    for (List<String> toolsDir in _getToolsDirs()) {
+      String cacheDir = toolsDir[0];
+      String urlPath = toolsDir[1];
+      Directory dir = new Directory(path.join(engineDir.path, cacheDir));
       if (!dir.existsSync() || allDirty) {
-        await _downloadItem('Downloading engine tools $dirName...',
-          url + dirName + '/artifacts.zip', dir);
+        await _downloadItem('Downloading engine tools $cacheDir...',
+          url + urlPath, dir);
         _makeFilesExecutable(dir);
       }
     }

packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -32,13 +32,13 @@ class BuildAotCommand extends FlutterCommand {
   final String name = 'aot';
 
   @override
-  final String description = "Build an ahead-of-time compiled snapshot of your app's Dart code. "
-                             "(local engine builds only)";
+  final String description = "Build an ahead-of-time compiled snapshot of your app's Dart code.";
 
   @override
   Future<int> runInProject() async {
     String outputPath = buildAotSnapshot(
       findMainDartFile(argResults['target']),
+      getBuildMode(),
       outputPath: argResults['output-dir']
     );
     if (outputPath == null)
@@ -55,18 +55,30 @@ String _getSdkExtensionPath(String packagesPath, String package) {
 }
 
 String buildAotSnapshot(
-  String mainPath, {
+  String mainPath,
+  BuildMode buildMode, {
   String outputPath: _kDefaultAotOutputDir
 }) {
-  String engineSrc = tools.engineSrcPath;
-  if (engineSrc == null) {
-    printError('AOT compilation requires --engine-src-path');
+  if (!isAotBuildMode(buildMode)) {
+    printError('${getModeName(buildMode)} mode does not support AOT compilation.');
     return null;
   }
 
-  String engineOut = tools.getEngineArtifactsDirectory(
-      TargetPlatform.android_arm, BuildMode.profile).path;
-  String genSnapshot = path.join(engineOut, 'clang_x86', 'gen_snapshot');
+  String entryPointsDir, genSnapshot;
+
+  String engineSrc = tools.engineSrcPath;
+  if (engineSrc != null) {
+    entryPointsDir  = path.join(engineSrc, 'sky', 'engine', 'bindings');
+    String engineOut = tools.getEngineArtifactsDirectory(
+        TargetPlatform.android_arm, buildMode).path;
+    genSnapshot = path.join(engineOut, 'clang_x86', 'gen_snapshot');
+  } else {
+    String artifactsDir = tools.getEngineArtifactsDirectory(
+        TargetPlatform.android_arm, buildMode).path;
+    entryPointsDir = artifactsDir;
+    String hostToolsDir = path.join(artifactsDir, getNameForHostPlatform(getCurrentHostPlatform()));
+    genSnapshot = path.join(hostToolsDir, 'gen_snapshot');
+  }
 
   Directory outputDir = new Directory(outputPath);
   outputDir.createSync(recursive: true);
@@ -75,9 +87,8 @@ String buildAotSnapshot(
   String instructionsBlob = path.join(outputDir.path, 'snapshot_aot_instr');
   String rodataBlob = path.join(outputDir.path, 'snapshot_aot_rodata');
 
-  String bindingsSrc = path.join(engineSrc, 'sky', 'engine', 'bindings');
-  String vmEntryPoints = path.join(bindingsSrc, 'dart_vm_entry_points.txt');
-  String vmEntryPointsAndroid = path.join(bindingsSrc, 'dart_vm_entry_points_android.txt');
+  String vmEntryPoints = path.join(entryPointsDir, 'dart_vm_entry_points.txt');
+  String vmEntryPointsAndroid = path.join(entryPointsDir, 'dart_vm_entry_points_android.txt');
 
   String packagesPath = path.absolute(Directory.current.path, 'packages');
   if (!FileSystemEntity.isDirectorySync(packagesPath)) {
@@ -119,7 +130,7 @@ String buildAotSnapshot(
     '--no-sim-use-hardfp',
   ];
 
-  if (!tools.engineRelease) {
+  if (!(tools.engineRelease || buildMode == BuildMode.release)) {
     genSnapshotCmd.addAll([
       '--no-checked',
       '--conditional_directives',

packages/flutter_tools/lib/src/commands/build_apk.dart

@@ -428,9 +428,6 @@ bool _needsRebuild(String apkPath, String manifest) {
   return false;
 }
 
-// Returns true if the selected build mode uses ahead-of-time compilation.
-bool _isAotBuildMode(BuildMode mode) => mode == BuildMode.profile;
-
 Future<int> buildAndroid(
   TargetPlatform platform,
   BuildMode buildMode, {
@@ -494,13 +491,13 @@ Future<int> buildAndroid(
     flxPath = await flx.buildFlx(
       toolchain,
       mainPath: findMainDartFile(target),
-      precompiledSnapshot: _isAotBuildMode(buildMode),
+      precompiledSnapshot: isAotBuildMode(buildMode),
       includeRobotoFonts: false);
   }
 
   // Build an AOT snapshot if needed.
-  if (_isAotBuildMode(buildMode) && aotPath == null) {
-    aotPath = buildAotSnapshot(findMainDartFile(target));
+  if (isAotBuildMode(buildMode) && aotPath == null) {
+    aotPath = buildAotSnapshot(findMainDartFile(target), buildMode);
     if (aotPath == null) {
       printError('Failed to build AOT snapshot');
       return 1;
@@ -508,7 +505,7 @@ Future<int> buildAndroid(
   }
 
   if (aotPath != null) {
-    if (!_isAotBuildMode(buildMode)) {
+    if (!isAotBuildMode(buildMode)) {
       printError('AOT snapshot can not be used in build mode $buildMode');
       return 1;
     }

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -66,7 +66,6 @@ abstract class FlutterCommand extends Command {
       negatable: false,
       help: 'Build a debug version of your app (the default).');
     argParser.addFlag('profile',
-      hide: true,
       negatable: false,
       help: 'Build a profile (ahead of time compilation) version of your app.');
     argParser.addFlag('release',

packages/flutter_tools/lib/src/toolchain.dart

@@ -163,13 +163,12 @@ class ToolConfiguration {
 
       // Return something like 'out/android_Release'.
       String buildOutputPath = 'out/${type}_$_modeStr';
-      if (mode == BuildMode.profile)
+      if (isAotBuildMode(mode))
         buildOutputPath += '_Deploy';
 
       return new Directory(path.join(engineSrcPath, buildOutputPath));
     } else {
-      // For now, only suffix for deploy variants.
-      String suffix = mode == BuildMode.release ? '-${getModeName(mode)}' : '';
+      String suffix = mode != BuildMode.debug ? '-${getModeName(mode)}' : '';
 
       // Create something like `android-arm` or `android-arm-release`.
       String dirName = getNameForTargetPlatform(platform) + suffix;