Migrates battery_status from content/renderer/ to WebKit/platform/

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 227 matching lines @@
       'audio/UpSampler.cpp',
       'audio/UpSampler.h',
       'audio/VectorMath.cpp',
       'audio/VectorMath.h',
       'audio/ZeroPole.cpp',
       'audio/ZeroPole.h',
       'audio/android/FFTFrameOpenMAXDLAndroid.cpp',
       'audio/ffmpeg/FFTFrameFFMPEG.cpp',
       'audio/ipp/FFTFrameIPP.cpp',
       'audio/mac/FFTFrameMac.cpp',
+      'battery/battery_status.h',
+      'battery/battery_status_dispatcher.cc',
+      'battery/battery_status_dispatcher.h',
+      'battery/battery_status_listener.h',
       'blob/BlobData.cpp',
       'blob/BlobData.h',
       'blob/BlobRegistry.cpp',
       'blob/BlobRegistry.h',
       'blob/BlobURL.cpp',
       'blob/BlobURL.h',
       'clipboard/ClipboardMimeTypes.cpp',
       'clipboard/ClipboardMimeTypes.h',
       'clipboard/ClipboardUtilities.cpp',
       'clipboard/ClipboardUtilities.h',
@@ skipping 751 matching lines @@
       'PODRedBlackTreeTest.cpp',
       'PurgeableVectorTest.cpp',
       'SharedBufferTest.cpp',
       'TimerTest.cpp',
       'TracedValueTest.cpp',
       'UUIDTest.cpp',
       'WebScreenInfoTest.cpp',
       'WebVectorTest.cpp',
       'animation/TimingFunctionTest.cpp',
       'animation/UnitBezierTest.cpp',
+      'battery/battery_status_dispatcher_unittest.cc',
       'blob/BlobDataTest.cpp',
       'clipboard/ClipboardUtilitiesTest.cpp',
       'fonts/CharacterTest.cpp',
       'fonts/FontCacheTest.cpp',
       'fonts/FontDescriptionTest.cpp',
       'fonts/GlyphBufferTest.cpp',
       'fonts/GlyphPageTreeNodeTest.cpp',
       'fonts/OrientationIteratorTest.cpp',
       'fonts/ScriptRunIteratorTest.cpp',
       'fonts/SmallCapsIteratorTest.cpp',
@@ skipping 120 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }