Chromium implementation of discardBackbuffer WebGraphicsContext3D extension.

webkit/gpu/webgraphicscontext3d_in_process_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_impl.cc
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
index 0a331f419ce4b3e7ca7d16eefc2df2417872d10e..6fefa743c8a24c3f2212c31da85e4150a38ae3cb 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
@@ -729,6 +729,18 @@ void WebGraphicsContext3DInProcessImpl::unmapTexSubImage2DCHROMIUM(
 void WebGraphicsContext3DInProcessImpl::setVisibilityCHROMIUM(bool visible) {
 }
 
+void WebGraphicsContext3DInProcessImpl::
+    setMemoryAllocationChangedCallbackCHROMIUM(
+        WebGraphicsMemoryAllocationChangedCallbackCHROMIUM* callback) {
+}
+
+void WebGraphicsContext3DInProcessImpl::discardFramebufferEXT(
+    WGC3Denum target, WGC3Dsizei numAttachments, const WGC3Denum* attachments) {
+}
+
+void WebGraphicsContext3DInProcessImpl::ensureFramebufferCHROMIUM() {
+}
+
 void WebGraphicsContext3DInProcessImpl::copyTextureToParentTextureCHROMIUM(
     WebGLId id, WebGLId id2) {
   NOTIMPLEMENTED();