cc: Call PrepareTiles when becoming visible in browser only.

cc/trees/single_thread_proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
@@ skipping 104 matching lines @@
   DebugScopedSetImplThread impl(this);
   if (scheduler_on_impl_thread_) {
     scheduler_on_impl_thread_->SetCanStart();
     scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
   }
 }
 
 void SingleThreadProxy::SetVisible(bool visible) {
   TRACE_EVENT1("cc", "SingleThreadProxy::SetVisible", "visible", visible);
   DebugScopedSetImplThread impl(this);
+
+  bool was_visible = layer_tree_host_impl_->visible();
   layer_tree_host_impl_->SetVisible(visible);
+
+  // Call PrepareTiles in case we're waiting for ready to draw.
+  if (!was_visible && visible)
+    layer_tree_host_impl_->PrepareTiles();
+
   if (scheduler_on_impl_thread_)
     scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
   // Changing visibility could change ShouldComposite().
 }
 
 void SingleThreadProxy::SetThrottleFrameProduction(bool throttle) {
   TRACE_EVENT1("cc", "SingleThreadProxy::SetThrottleFrameProduction",
                "throttle", throttle);
   DebugScopedSetImplThread impl(this);
   if (scheduler_on_impl_thread_)
@@ skipping 786 matching lines @@
       << "DidFinishImplFrame called while not inside an impl frame!";
   inside_impl_frame_ = false;
 #endif
 }
 
 void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc