Rename discardFramebufferEXT to discardBackbufferCHROMIUM to avoid collision with real discardFramebufferEXT

Calling the (real) discardFramebufferEXT in the compositor is a performance win, at least on tilers. However
currently it can't be called because we alias the name for a different API that controls backbuffer
allocation, which I don't want to change.  This renames the code to make backbuffer control a completely
separate API so I can pipe GL_EXT_discard_framebuffer in fully as a follow-up.

Depends on https://bugs.webkit.org/show_bug.cgi?id=104316

BUG=


Review URL: https://chromiumcodereview.appspot.com/11474014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171908 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 6 insertions, 2 deletions

diff --git a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
index 663fcbf..b5d0a65 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
@@ -745,7 +745,10 @@ void WebGraphicsContext3DInProcessImpl::discardFramebufferEXT(
     WGC3Denum target, WGC3Dsizei numAttachments, const WGC3Denum* attachments) {
 }
 
-void WebGraphicsContext3DInProcessImpl::ensureFramebufferCHROMIUM() {
+void WebGraphicsContext3DInProcessImpl::discardBackbufferCHROMIUM() {
+}
+
+void WebGraphicsContext3DInProcessImpl::ensureBackbufferCHROMIUM() {
 }
 
 void WebGraphicsContext3DInProcessImpl::copyTextureToParentTextureCHROMIUM(
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_impl.h b/webkit/gpu/webgraphicscontext3d_in_process_impl.h
index bd36c99..7bfe980 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.h
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.h
@@ -117,7 +117,8 @@ class WEBKIT_GPU_EXPORT WebGraphicsContext3DInProcessImpl :
   virtual void discardFramebufferEXT(WGC3Denum target,
                                      WGC3Dsizei numAttachments,
                                      const WGC3Denum* attachments);
-  virtual void ensureFramebufferCHROMIUM();
+  virtual void discardBackbufferCHROMIUM();
+  virtual void ensureBackbufferCHROMIUM();
 
   virtual void copyTextureToParentTextureCHROMIUM(
       WebGLId texture, WebGLId parentTexture);