cc: Move gpu rasterization flag from tree-impl to tree-host-impl.

cc/trees/layer_tree_host_impl.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/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 197 matching lines @@
 
 LayerTreeHostImpl::LayerTreeHostImpl(
     const LayerTreeSettings& settings,
     LayerTreeHostImplClient* client,
     Proxy* proxy,
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     SharedBitmapManager* manager,
     int id)
     : client_(client),
       proxy_(proxy),
+      use_gpu_rasterization_(false),
       input_handler_client_(NULL),
       did_lock_scrolling_layer_(false),
       should_bubble_scrolls_(false),
       wheel_scrolling_(false),
       scroll_affects_scroll_handler_(false),
       scroll_layer_id_when_mouse_over_scrollbar_(0),
       tile_priorities_dirty_(false),
       root_layer_scroll_offset_delegate_(NULL),
       settings_(settings),
       visible_(true),
@@ skipping 1285 matching lines @@
 void LayerTreeHostImpl::FinishAllRendering() {
   if (renderer_)
     renderer_->Finish();
 }
 
 bool LayerTreeHostImpl::IsContextLost() {
   DCHECK(proxy_->IsImplThread());
   return renderer_ && renderer_->IsContextLost();
 }
 
+void LayerTreeHostImpl::SetUseGpuRasterization(bool use_gpu) {
+  if (use_gpu == use_gpu_rasterization_)
+    return;
+
+  use_gpu_rasterization_ = use_gpu;
+  ReleaseTreeResources();
+
+  // We have released tilings for both active and pending tree.
+  // We would not have any content to draw until the pending tree is activated.
+  // Prevent the active tree from drawing until activation.
+  active_tree_->SetRequiresHighResToDraw();
+}
+
 const RendererCapabilitiesImpl&
 LayerTreeHostImpl::GetRendererCapabilities() const {
   return renderer_->Capabilities();
 }
 
 bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
   active_tree()->ResetRequiresHighResToDraw();
   if (frame.has_no_damage) {
     active_tree()->BreakSwapPromises(SwapPromise::SWAP_FAILS);
     return false;
@@ skipping 233 matching lines @@
   client_->SetNeedsAnimateOnImplThread();
 }
 
 void LayerTreeHostImpl::SetNeedsRedraw() {
   NotifySwapPromiseMonitorsOfSetNeedsRedraw();
   client_->SetNeedsRedrawOnImplThread();
 }
 
 ManagedMemoryPolicy LayerTreeHostImpl::ActualManagedMemoryPolicy() const {
   ManagedMemoryPolicy actual = cached_managed_memory_policy_;
-  bool any_tree_use_gpu_rasterization =
-      (active_tree_ && active_tree_->use_gpu_rasterization()) ||
-      (pending_tree_ && pending_tree_->use_gpu_rasterization());
   if (debug_state_.rasterize_only_visible_content) {
     actual.priority_cutoff_when_visible =
         gpu::MemoryAllocation::CUTOFF_ALLOW_REQUIRED_ONLY;
-  } else if (any_tree_use_gpu_rasterization) {
+  } else if (use_gpu_rasterization()) {
     actual.priority_cutoff_when_visible =
         gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
   }
 
   if (zero_budget_) {
     actual.bytes_limit_when_visible = 0;
   }
 
   return actual;
 }
@@ skipping 1330 matching lines @@
   swap_promise_monitor_.erase(monitor);
 }
 
 void LayerTreeHostImpl::NotifySwapPromiseMonitorsOfSetNeedsRedraw() {
   std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
   for (; it != swap_promise_monitor_.end(); it++)
     (*it)->OnSetNeedsRedrawOnImpl();
 }
 
 }  // namespace cc