Rewire Android WebView's compositor changed signal.

content/browser/android/synchronous_compositor_host.cc

Index: content/browser/android/synchronous_compositor_host.cc
diff --git a/content/browser/android/synchronous_compositor_host.cc b/content/browser/android/synchronous_compositor_host.cc
index a4fbdcc5b2a2a758eec0090bd9e3d6cff61dee94..f5d9e5837036cc13e4e98c4f8336f0c4ed2375cf 100644
--- a/content/browser/android/synchronous_compositor_host.cc
+++ b/content/browser/android/synchronous_compositor_host.cc
@@ -68,6 +68,7 @@ SynchronousCompositorHost::SynchronousCompositorHost(
       client_(client),
       ui_task_runner_(
           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI)),
+      process_id_(rwhva_->GetRenderWidgetHost()->GetProcess()->GetID()),
       routing_id_(rwhva_->GetRenderWidgetHost()->GetRoutingID()),
       sender_(rwhva_->GetRenderWidgetHost()),
       use_in_process_zero_copy_software_draw_(use_in_proc_software_draw),
@@ -76,11 +77,11 @@ SynchronousCompositorHost::SynchronousCompositorHost(
       need_animate_scroll_(false),
       need_invalidate_count_(0u),
       did_activate_pending_tree_count_(0u) {
-  client_->DidInitializeCompositor(this);
+  client_->DidInitializeCompositor(this, process_id_, routing_id_);
 }
 
 SynchronousCompositorHost::~SynchronousCompositorHost() {
-  client_->DidDestroyCompositor(this);
+  client_->DidDestroyCompositor(this, process_id_, routing_id_);
 }
 
 bool SynchronousCompositorHost::OnMessageReceived(const IPC::Message& message) {
@@ -94,10 +95,6 @@ bool SynchronousCompositorHost::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
-void SynchronousCompositorHost::DidBecomeCurrent() {
-  client_->DidBecomeCurrent(this);
-}
-
 SynchronousCompositor::Frame SynchronousCompositorHost::DemandDrawHw(
     const gfx::Size& surface_size,
     const gfx::Transform& transform,