Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
index 46403d702f8709c8b4946aaf9976dbc2accdc74d..e738004281ee455b23de0eee8a397ea9747abbb5 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
@@ -1643,6 +1643,18 @@ DELEGATE_TO_GL_2(bindTexImage2DCHROMIUM, BindTexImage2DCHROMIUM,
 DELEGATE_TO_GL_2(releaseTexImage2DCHROMIUM, ReleaseTexImage2DCHROMIUM,
                  WGC3Denum, WGC3Dint)
 
+void* WebGraphicsContext3DInProcessCommandBufferImpl::mapBufferCHROMIUM(
+    WGC3Denum target, WGC3Denum access) {
+  ClearContext();
+  return gl_->MapBufferCHROMIUM(target, access);
+}
+
+WGC3Dboolean WebGraphicsContext3DInProcessCommandBufferImpl::
+    unmapBufferCHROMIUM(WGC3Denum target) {
+  ClearContext();
+  return gl_->UnmapBufferCHROMIUM(target);
+}
+
 GrGLInterface* WebGraphicsContext3DInProcessCommandBufferImpl::
     onCreateGrGLInterface() {
   return webkit_glue::CreateCommandBufferSkiaGLBinding();