Decoupling backbuffer allocation suggestion from frontbuffer allocation suggestion.

ui/gl/gl_surface.cc

Index: ui/gl/gl_surface.cc
diff --git a/ui/gl/gl_surface.cc b/ui/gl/gl_surface.cc
index cc6c3b3a76d6e013ad5d55b6400053c0d313acd1..b5b2fd7f1416bebb6ccab412556c25e2fa8e0f10 100644
--- a/ui/gl/gl_surface.cc
+++ b/ui/gl/gl_surface.cc
@@ -101,7 +101,10 @@ bool GLSurface::OnMakeCurrent(GLContext* context) {
   return true;
 }
 
-void GLSurface::SetBufferAllocation(BufferAllocationState state) {
+void GLSurface::SetBackbufferAllocation(bool allocated) {
+}
+
+void GLSurface::SetFrontbufferAllocation(bool allocated) {
 }
 
 void* GLSurface::GetShareHandle() {
@@ -183,8 +186,12 @@ bool GLSurfaceAdapter::OnMakeCurrent(GLContext* context) {
   return surface_->OnMakeCurrent(context);
 }
 
-void GLSurfaceAdapter::SetBufferAllocation(BufferAllocationState state) {
-  surface_->SetBufferAllocation(state);
+void GLSurfaceAdapter::SetBackbufferAllocation(bool allocated) {
+  surface_->SetBackbufferAllocation(allocated);
+}
+
+void GLSurfaceAdapter::SetFrontbufferAllocation(bool allocated) {
+  surface_->SetFrontbufferAllocation(allocated);
 }
 
 void* GLSurfaceAdapter::GetShareHandle() {