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 022e02a6c155595dfc73613989e904f4d9d2a8a9..8ec3adb970637eef57ee197b47566e173cae9884 100644
--- a/Source/core/html/canvas/OESTextureHalfFloat.cpp
+++ b/Source/core/html/canvas/OESTextureHalfFloat.cpp
@@ -30,7 +30,7 @@
 
 namespace WebCore {
 
-OESTextureHalfFloat::OESTextureHalfFloat(WebGLRenderingContext* context)
+OESTextureHalfFloat::OESTextureHalfFloat(WebGLRenderingContextBase* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
@@ -41,17 +41,17 @@ OESTextureHalfFloat::~OESTextureHalfFloat()
 {
 }
 
-WebGLExtension::ExtensionName OESTextureHalfFloat::getName() const
+WebGLExtensionName OESTextureHalfFloat::getName() 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)
 {
     Extensions3D* extensions = context->graphicsContext3D()->getExtensions();
     return extensions->supports("GL_OES_texture_half_float");