Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

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 27daf11cb88d1e44486b4792bbc3bec80e670abb..663fcbfaa1b80e60a2c1eaffdefb79357135687f 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
@@ -1714,6 +1714,16 @@ void WebGraphicsContext3DInProcessImpl::releaseTexImage2DCHROMIUM(
   NOTIMPLEMENTED();
 }
 
+void* WebGraphicsContext3DInProcessImpl::mapBufferCHROMIUM(
+    WGC3Denum target, WGC3Denum access) {
+  return 0;
+}
+
+WGC3Dboolean WebGraphicsContext3DInProcessImpl::unmapBufferCHROMIUM(
+    WGC3Denum target) {
+  return false;
+}
+
 GrGLInterface* WebGraphicsContext3DInProcessImpl::onCreateGrGLInterface() {
   return gfx::CreateInProcessSkiaGLBinding();
 }