Android should be able to discard CachedResources

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFilterRule.idl',
             'css/CSSFilterValue.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
@@ skipping 2483 matching lines @@
             'platform/PlatformSpeechSynthesisUtterance.cpp',
             'platform/PlatformSpeechSynthesisUtterance.h',
             'platform/PlatformSpeechSynthesisVoice.cpp',
             'platform/PlatformSpeechSynthesisVoice.h',
             'platform/PlatformSpeechSynthesizer.cpp',
             'platform/PlatformSpeechSynthesizer.h',
             'platform/PlatformTouchEvent.h',
             'platform/PlatformTouchPoint.h',
             'platform/PrerenderHandle.h',
             'platform/PrerenderClient.h',
+            'platform/PurgeableBuffer.cpp',
             'platform/PurgeableBuffer.h',
             'platform/SSLKeyGenerator.h',
             'platform/ScrollAnimator.cpp',
             'platform/ScrollAnimator.h',
             'platform/ScrollAnimatorNone.cpp',
             'platform/ScrollAnimatorNone.h',
             'platform/ScrollView.cpp',
             'platform/ScrollableArea.cpp',
             'platform/Scrollbar.cpp',
             'platform/ScrollbarTheme.cpp',
@@ skipping 484 matching lines @@
             'platform/leveldb/LevelDBTransaction.cpp',
             'platform/leveldb/LevelDBTransaction.h',
             'platform/leveldb/LevelDBWriteBatch.cpp',
             'platform/leveldb/LevelDBWriteBatch.h',
             'platform/mac/BlockExceptions.mm',
             'platform/mac/KillRingMac.mm',
             'platform/mac/LocalCurrentGraphicsContext.h',
             'platform/mac/LocalCurrentGraphicsContext.mm',
             'platform/mac/NSScrollerImpDetails.h',
             'platform/mac/NSScrollerImpDetails.mm',
-            'platform/mac/PurgeableBufferMac.cpp',
             'platform/mac/ScrollAnimatorMac.h',
             'platform/mac/ScrollAnimatorMac.mm',
             'platform/mac/ScrollElasticityController.h',
             'platform/mac/ScrollElasticityController.mm',
             'platform/mac/ScrollbarThemeMac.h',
             'platform/mac/ScrollbarThemeMac.mm',
             'platform/mac/ThemeMac.h',
             'platform/mac/ThemeMac.mm',
             'platform/mac/WebFontCache.mm',
             'platform/mediastream/MediaConstraints.h',
@@ skipping 684 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }