Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/core.gypi

 {
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/Player.idl',
             'animation/TimedItem.idl',
             'animation/Timeline.idl',
             'clipboard/Clipboard.idl',
             'clipboard/DataTransferItem.idl',
@@ skipping 230 matching lines @@
             'html/canvas/WebGLContextEvent.idl',
             'html/canvas/WebGLDebugRendererInfo.idl',
             'html/canvas/WebGLDebugShaders.idl',
             'html/canvas/WebGLDepthTexture.idl',
             'html/canvas/WebGLDrawBuffers.idl',
             'html/canvas/WebGLFramebuffer.idl',
             'html/canvas/WebGLLoseContext.idl',
             'html/canvas/WebGLProgram.idl',
             'html/canvas/WebGLRenderbuffer.idl',
             'html/canvas/WebGLRenderingContext.idl',
+            'html/canvas/WebGLRenderingContextBase.idl',
             'html/canvas/WebGLShader.idl',
             'html/canvas/WebGLShaderPrecisionFormat.idl',
             'html/canvas/WebGLTexture.idl',
             'html/canvas/WebGLUniformLocation.idl',
             'html/canvas/WebGLVertexArrayObjectOES.idl',
             'html/ime/InputMethodContext.idl',
             'html/shadow/HTMLContentElement.idl',
             'html/shadow/HTMLShadowElement.idl',
             'html/track/TextTrack.idl',
             'html/track/TextTrackCue.idl',
@@ skipping 2198 matching lines @@
             'html/canvas/WebGLDebugRendererInfo.cpp',
             'html/canvas/WebGLDebugRendererInfo.h',
             'html/canvas/WebGLDebugShaders.cpp',
             'html/canvas/WebGLDebugShaders.h',
             'html/canvas/WebGLDepthTexture.cpp',
             'html/canvas/WebGLDepthTexture.h',
             'html/canvas/WebGLDrawBuffers.cpp',
             'html/canvas/WebGLDrawBuffers.h',
             'html/canvas/WebGLExtension.cpp',
             'html/canvas/WebGLExtension.h',
+            'html/canvas/WebGLExtensionNames.h',
             'html/canvas/WebGLFramebuffer.cpp',
             'html/canvas/WebGLFramebuffer.h',
             'html/canvas/WebGLGetInfo.cpp',
             'html/canvas/WebGLGetInfo.h',
             'html/canvas/WebGLLoseContext.cpp',
             'html/canvas/WebGLLoseContext.h',
             'html/canvas/WebGLObject.cpp',
             'html/canvas/WebGLObject.h',
             'html/canvas/WebGLProgram.cpp',
             'html/canvas/WebGLProgram.h',
             'html/canvas/WebGLRenderbuffer.cpp',
             'html/canvas/WebGLRenderbuffer.h',
             '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/WebGLTexture.cpp',
             'html/canvas/WebGLTexture.h',
             'html/canvas/WebGLUniformLocation.cpp',
             'html/canvas/WebGLUniformLocation.h',
@@ skipping 764 matching lines @@
             'html/parser/HTMLParserThreadTest.cpp',
             'html/track/vtt/BufferedLineReaderTest.cpp',
             'html/track/vtt/VTTScannerTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
         ],
     }
 }