Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/OESTextureHalfFloatLinear.cpp

Index: Source/core/html/canvas/OESTextureHalfFloatLinear.cpp
diff --git a/Source/core/html/canvas/OESTextureHalfFloatLinear.cpp b/Source/core/html/canvas/OESTextureHalfFloatLinear.cpp
index 6a69c9332fefba9833f992368a34a86a72bcca27..b8246072cba7ad5af8656c26407989e7f9320f7e 100644
--- a/Source/core/html/canvas/OESTextureHalfFloatLinear.cpp
+++ b/Source/core/html/canvas/OESTextureHalfFloatLinear.cpp
@@ -31,7 +31,7 @@
 
 namespace WebCore {
 
-OESTextureHalfFloatLinear::OESTextureHalfFloatLinear(WebGLRenderingContext* context)
+OESTextureHalfFloatLinear::OESTextureHalfFloatLinear(WebGLRenderingContextBase* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
@@ -47,12 +47,12 @@ WebGLExtension::ExtensionName OESTextureHalfFloatLinear::getName() const
     return OESTextureHalfFloatLinearName;
 }
 
-PassRefPtr<OESTextureHalfFloatLinear> OESTextureHalfFloatLinear::create(WebGLRenderingContext* context)
+PassRefPtr<OESTextureHalfFloatLinear> OESTextureHalfFloatLinear::create(WebGLRenderingContextBase* context)
 {
     return adoptRef(new OESTextureHalfFloatLinear(context));
 }
 
-bool OESTextureHalfFloatLinear::supported(WebGLRenderingContext* context)
+bool OESTextureHalfFloatLinear::supported(WebGLRenderingContextBase* context)
 {
     Extensions3D* extensions = context->graphicsContext3D()->getExtensions();
     return extensions->supports("GL_OES_texture_half_float_linear");