Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/OESTextureHalfFloat.cpp

Index: Source/core/html/canvas/OESTextureHalfFloat.cpp
diff --git a/Source/core/html/canvas/OESTextureHalfFloat.cpp b/Source/core/html/canvas/OESTextureHalfFloat.cpp
index 6d792b6a2beebdf5b40208abfa7ccf6dc5b4c2ec..dd7f119c94796d7a96eae9c9f8385d9fba3d1198 100644
--- a/Source/core/html/canvas/OESTextureHalfFloat.cpp
+++ b/Source/core/html/canvas/OESTextureHalfFloat.cpp
@@ -29,7 +29,7 @@
 
 namespace WebCore {
 
-OESTextureHalfFloat::OESTextureHalfFloat(WebGLRenderingContext* context)
+OESTextureHalfFloat::OESTextureHalfFloat(WebGLRenderingContextBase* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
@@ -40,17 +40,17 @@ OESTextureHalfFloat::~OESTextureHalfFloat()
 {
 }
 
-WebGLExtension::ExtensionName OESTextureHalfFloat::name() const
+WebGLExtensionName OESTextureHalfFloat::name() const
 {
     return OESTextureHalfFloatName;
 }
 
-PassRefPtr<OESTextureHalfFloat> OESTextureHalfFloat::create(WebGLRenderingContext* context)
+PassRefPtr<OESTextureHalfFloat> OESTextureHalfFloat::create(WebGLRenderingContextBase* context)
 {
     return adoptRef(new OESTextureHalfFloat(context));
 }
 
-bool OESTextureHalfFloat::supported(WebGLRenderingContext* context)
+bool OESTextureHalfFloat::supported(WebGLRenderingContextBase* context)
 {
     return context->extensionsUtil()->supportsExtension("GL_OES_texture_half_float");
 }