Shard Travis job into three pieces (#8232)

.travis.yml

@@ -8,8 +8,11 @@ addons:
       - libstdc++6
       - fonts-droid
 install:
-  - gem install coveralls-lcov
-  - npm install -g firebase-tools@">=3.0.4 <3.1.0"
+  - ./dev/bots/travis_install.sh
+env:
+  - SHARD=analyze
+  - SHARD=tests
+  - SHARD=docs
 before_script:
   - ./dev/bots/travis_setup.sh
 script:

dev/bots/test.dart

@@ -13,11 +13,23 @@ String flutterTestArgs = Platform.environment['FLUTTER_TEST_ARGS'];
 /// script using FLUTTER_TEST_ARGS=--local-engine=host_debug_unopt to
 /// use your own build of the engine.
 Future<Null> main() async {
+  if (Platform.environment['SHARD'] == 'docs') {
+    print('\x1B[32mDONE: test.dart does nothing in the docs shard.\x1B[0m');
+  } else if (Platform.environment['SHARD'] == 'analyze') {
     // Analyze all the Dart code in the repo.
     await _runFlutterAnalyze(flutterRoot,
       options: <String>['--flutter-repo'],
     );
 
+    await _runCmd(dart, <String>[p.join(flutterRoot, 'dev', 'tools', 'mega_gallery.dart')],
+      workingDirectory: flutterRoot,
+    );
+    await _runFlutterAnalyze(p.join(flutterRoot, 'dev', 'benchmarks', 'mega_gallery'),
+      options: <String>['--watch', '--benchmark'],
+    );
+
+    print('\x1B[32mDONE: Analysis successful.\x1B[0m');
+  } else {
     // Verify that the tests actually return failure on failure and success on success.
     String automatedTests = p.join(flutterRoot, 'dev', 'automated_tests');
     await _runFlutterTest(automatedTests,
@@ -77,14 +89,8 @@ Future<Null> main() async {
     await _runFlutterTest(p.join(flutterRoot, 'examples', 'stocks'));
     await _runFlutterTest(p.join(flutterRoot, 'examples', 'flutter_gallery'));
 
-  await _runCmd(dart, <String>[p.join(flutterRoot, 'dev', 'tools', 'mega_gallery.dart')],
-      workingDirectory: flutterRoot,
-  );
-  await _runFlutterAnalyze(p.join(flutterRoot, 'dev', 'benchmarks', 'mega_gallery'),
-      options: <String>['--watch', '--benchmark'],
-  );
-
     print('\x1B[32mDONE: All tests successful.\x1B[0m');
+  }
 }
 
 Future<Null> _runCmd(String executable, List<String> arguments, {

dev/bots/travis_install.sh

+#!/bin/bash
+set -ex
+
+if [ -n "$TRAVIS" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+  - gem install coveralls-lcov
+  - npm install -g firebase-tools@">=3.0.4 <3.1.0"
+fi

dev/bots/travis_upload.sh

@@ -17,5 +17,7 @@ if [ "$TRAVIS_PULL_REQUEST" = "false" ] && [ "$TRAVIS_BRANCH" = "master" ] && [
   (cd packages/flutter && coveralls-lcov coverage/lcov.info)
 fi
 
-# generate the API docs, upload them
-./dev/bots/docs.sh
+if [ "$SHARD" = "docs" ]; then
+  # generate the API docs, upload them
+  ./dev/bots/docs.sh
+fi