cc: Move gpu rasterization flag from LayerImpl to LayerTreeImpl.

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 314 matching lines @@
     active_tree_->ResetContentsTexturesPurged();
   }
 }
 
 void LayerTreeHostImpl::BeginCommit() {}
 
 void LayerTreeHostImpl::CommitComplete() {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::CommitComplete");
 
   if (settings_.impl_side_painting) {
+    if (pending_tree_->use_gpu_rasterization() !=
+        active_tree_->use_gpu_rasterization()) {
+      // We need to recreate tilings for all layers in the pending tree.
+      // The tile size and rasterization is different for sw and gpu rasterizer.
+      SendReleaseResourcesRecursive(pending_tree_->root_layer());
+      // TODO(alokp): Rip out rasterizer delegate and switch rasterizers here.
+    }
     // Impl-side painting needs an update immediately post-commit to have the
     // opportunity to create tilings.  Other paths can call UpdateDrawProperties
     // more lazily when needed prior to drawing.
     pending_tree()->ApplyScrollDeltasSinceBeginMainFrame();
     pending_tree_->set_needs_update_draw_properties();
     pending_tree_->UpdateDrawProperties();
     // Start working on newly created tiles immediately if needed.
     if (!tile_manager_ || !tile_priorities_dirty_)
       NotifyReadyToActivate();
     else
@@ skipping 2801 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