Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

ui/gfx/gl/gl_surface.cc

Index: ui/gfx/gl/gl_surface.cc
diff --git a/ui/gfx/gl/gl_surface.cc b/ui/gfx/gl/gl_surface.cc
index 3ff4fd1479bc88d740e3533af3c919d5e4958a18..19edb88eac543b7e469c487a64c980f0ced8ed89 100644
--- a/ui/gfx/gl/gl_surface.cc
+++ b/ui/gfx/gl/gl_surface.cc
@@ -107,7 +107,10 @@ 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() {
@@ -188,8 +191,12 @@ 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() {