Bug 1021864 - Part 1: Land mobile/android/search. r=margaret
Bug 1021864 - Part 2: Add build feature flag MOZ_ANDROID_SEARCH_ACTIVITY. r=rnewman
Bug 1021864 - Part 3: Include Search Activity strings in Fennec. r=rnewman
Bug 1021864 - Part 4: Build Search Activity as part of the Fennec APK. r=rnewman
Bug 1021864 - Post: Don't build Search Activity in Fennec by default. r=me