Moved image packing code out of GraphicsContext3D.cpp and into a new file

Source/core/core.gypi

 
 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
@@ skipping 2662 matching lines @@
             'platform/graphics/FontPlatformData.cpp',
             'platform/graphics/FontPlatformData.h',
             'platform/graphics/LayoutBoxExtent.cpp',
             'platform/graphics/GeneratorGeneratedImage.cpp',
             'platform/graphics/GeneratedImage.cpp',
             'platform/graphics/GeneratedImage.h',
             'platform/graphics/GlyphPageTreeNode.cpp',
             'platform/graphics/Gradient.cpp',
             'platform/graphics/GraphicsContext.cpp',
             'platform/graphics/GraphicsContext3D.cpp',
+            'platform/graphics/GraphicsContext3DImagePacking.cpp',
             'platform/graphics/GraphicsLayer.cpp',
             'platform/graphics/GraphicsLayerAnimation.cpp',
             'platform/graphics/GraphicsLayerAnimation.h',
             'platform/graphics/GraphicsLayerTransform.cpp',
             'platform/graphics/GraphicsLayerTransform.h',
             'platform/graphics/GraphicsTypes.cpp',
             'platform/graphics/Image.cpp',
             'platform/graphics/ImageBuffer.cpp',
             'platform/graphics/ImageOrientation.cpp',
             'platform/graphics/ImageSource.cpp',
@@ skipping 983 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++"'
               }],
          ],
     }
 }