cc: Expand invalidation to full tile when recording is missing for the tile.

cc/layers/picture_layer.cc

 // Copyright 2012 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/layers/picture_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
@@ skipping 103 matching lines @@
   // Calling paint in WebKit can sometimes cause invalidations, so save
   // off the invalidation prior to calling update.
   pending_invalidation_.Swap(&pile_invalidation_);
   pending_invalidation_.Clear();
 
   if (layer_tree_host()->settings().using_synchronous_renderer_compositor) {
     // Workaround for http://crbug.com/235910 - to retain backwards compat
     // the full page content must always be provided in the picture layer.
     visible_layer_rect = gfx::Rect(bounds());
   }
+
+  // UpdateAndExpandInvalidation will give us an invalidation that covers
+  // anything not explicitly recorded in this frame. We give this region
+  // to the impl side so that it drops tiles that may not have a recording
+  // for them.
   DCHECK(client_);
-  updated |= pile_->Update(client_,
-                           SafeOpaqueBackgroundColor(),
-                           contents_opaque(),
-                           client_->FillsBoundsCompletely(),
-                           pile_invalidation_,
-                           visible_layer_rect,
-                           update_source_frame_number_,
-                           RecordingMode(),
-                           rendering_stats_instrumentation());
+  updated |=
+      pile_->UpdateAndExpandInvalidation(client_,
+                                         &pile_invalidation_,
+                                         SafeOpaqueBackgroundColor(),
+                                         contents_opaque(),
+                                         client_->FillsBoundsCompletely(),
+                                         visible_layer_rect,
+                                         update_source_frame_number_,
+                                         RecordingMode(),
+                                         rendering_stats_instrumentation());
   last_updated_visible_content_rect_ = visible_content_rect();
 
   if (updated) {
     SetNeedsPushProperties();
   } else {
     // If this invalidation did not affect the pile, then it can be cleared as
     // an optimization.
     pile_invalidation_.Clear();
   }
 
@@ skipping 51 matching lines @@
 
 bool PictureLayer::IsSuitableForGpuRasterization() const {
   return pile_->is_suitable_for_gpu_rasterization();
 }
 
 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
   benchmark->RunOnLayer(this);
 }
 
 }  // namespace cc