Enable SkBitmap to be used by Mojo in Blink

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 251 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',
+      'bitmap_type_converters.cc',
+      'bitmap_type_converters.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 1025 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }