Add flags to pass '--enable-software-rendering' flag to engine in run command (#10449)

packages/flutter_tools/lib/src/android/android_device.dart

@@ -397,6 +397,8 @@ class AndroidDevice extends Device {
       cmd.addAll(<String>['--ez', 'trace-startup', 'true']);
     if (route != null)
       cmd.addAll(<String>['--es', 'route', route]);
+    if (debuggingOptions.enableSoftwareRendering)
+      cmd.addAll(<String>['--ez', 'enable-software-rendering', 'true']);
     if (debuggingOptions.debuggingEnabled) {
       if (debuggingOptions.buildMode == BuildMode.debug)
         cmd.addAll(<String>['--ez', 'enable-checked-mode', 'true']);

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

@@ -88,6 +88,13 @@ class RunCommand extends RunCommandBase {
         defaultsTo: false,
         negatable: false,
         help: 'Start in a paused mode and wait for a debugger to connect.');
+    argParser.addFlag('enable-software-rendering',
+        defaultsTo: false,
+        negatable: false,
+        help: 'Enable rendering using the Skia software backend. This is useful\n'
+              'when testing Flutter on emulators. By default, Flutter will\n'
+              'attempt to either use OpenGL or Vulkan and fall back to software\n'
+              'when neither is available.');
     argParser.addFlag('use-test-fonts',
         negatable: true,
         defaultsTo: false,
@@ -218,6 +225,7 @@ class RunCommand extends RunCommandBase {
         getBuildMode(),
         startPaused: argResults['start-paused'],
         useTestFonts: argResults['use-test-fonts'],
+        enableSoftwareRendering: argResults['enable-software-rendering'],
         observatoryPort: observatoryPort,
         diagnosticPort: diagnosticPort,
       );

packages/flutter_tools/lib/src/device.dart

@@ -299,6 +299,7 @@ abstract class Device {
 class DebuggingOptions {
   DebuggingOptions.enabled(this.buildMode, {
     this.startPaused: false,
+    this.enableSoftwareRendering: false,
     this.useTestFonts: false,
     this.observatoryPort,
     this.diagnosticPort
@@ -308,6 +309,7 @@ class DebuggingOptions {
     debuggingEnabled = false,
     useTestFonts = false,
     startPaused = false,
+    enableSoftwareRendering = false,
     observatoryPort = null,
     diagnosticPort = null;
 
@@ -315,6 +317,7 @@ class DebuggingOptions {
 
   final BuildMode buildMode;
   final bool startPaused;
+  final bool enableSoftwareRendering;
   final bool useTestFonts;
   final int observatoryPort;
   final int diagnosticPort;

packages/flutter_tools/lib/src/ios/devices.dart

@@ -242,6 +242,9 @@ class IOSDevice extends Device {
       // the port picked and scrape that later.
     }
 
+    if (debuggingOptions.enableSoftwareRendering) 
+      launchArguments.add('--enable-software-rendering');
+
     if (platformArgs['trace-startup'] ?? false)
       launchArguments.add('--trace-startup');