Refactor WebGraphicsContext3DInProcess and TestWebGraphicsContext3D

ui/gfx/compositor/compositor_cc.cc

Index: ui/gfx/compositor/compositor_cc.cc
diff --git a/ui/gfx/compositor/compositor_cc.cc b/ui/gfx/compositor/compositor_cc.cc
index 8957990c10b3f8402a424f2117bb22355afe298c..fa82ae1e7f5e5f7419373f22c9e664262bb4a7cf 100644
--- a/ui/gfx/compositor/compositor_cc.cc
+++ b/ui/gfx/compositor/compositor_cc.cc
@@ -262,15 +262,16 @@ WebKit::WebGraphicsContext3D* CompositorCC::createContext3D() {
   WebKit::WebGraphicsContext3D* context;
   if (test_compositor_enabled) {
     // Use context that results in no rendering to the screen.
-    context = new TestWebGraphicsContext3D();
+    TestWebGraphicsContext3D* test_context = new TestWebGraphicsContext3D();
+    test_context->initialize();
+    context = test_context;
   } else {
     gfx::GLShareGroup* share_group =
         SharedResourcesCC::GetInstance()->GetShareGroup();
-    context = new webkit::gpu::WebGraphicsContext3DInProcessImpl(
-        widget_, share_group);
+    WebKit::WebGraphicsContext3D::Attributes attrs;
+    context = webkit::gpu::WebGraphicsContext3DInProcessImpl::CreateForWindow(
+        attrs, widget_, share_group);
   }
-  WebKit::WebGraphicsContext3D::Attributes attrs;
-  context->initialize(attrs, 0, true);
 
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (!command_line->HasSwitch(switches::kDisableUIVsync)) {