Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/core.gypi

 {
     'includes': [
       'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationPlayer.idl',
@@ skipping 2573 matching lines @@
             'html/canvas/WebGLRenderingContext.cpp',
             'html/canvas/WebGLRenderingContext.h',
             'html/canvas/WebGLRenderingContextBase.cpp',
             'html/canvas/WebGLRenderingContextBase.h',
             'html/canvas/WebGLShader.cpp',
             'html/canvas/WebGLShader.h',
             'html/canvas/WebGLShaderPrecisionFormat.cpp',
             'html/canvas/WebGLShaderPrecisionFormat.h',
             'html/canvas/WebGLSharedObject.cpp',
             'html/canvas/WebGLSharedObject.h',
+            'html/canvas/WebGLSharedWebGraphicsContext3D.cpp',
+            'html/canvas/WebGLSharedWebGraphicsContext3D.h',
             'html/canvas/WebGLTexture.cpp',
             'html/canvas/WebGLTexture.h',
             'html/canvas/WebGLUniformLocation.cpp',
             'html/canvas/WebGLUniformLocation.h',
             'html/canvas/WebGLVertexArrayObjectOES.cpp',
             'html/canvas/WebGLVertexArrayObjectOES.h',
             'html/forms/BaseButtonInputType.cpp',
             'html/forms/BaseButtonInputType.h',
             'html/forms/BaseCheckableInputType.cpp',
             'html/forms/BaseCheckableInputType.h',
@@ skipping 819 matching lines @@
             'rendering/RenderOverflowTest.cpp',
             'rendering/RenderTableCellTest.cpp',
             'rendering/RenderTableRowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }