Add a flag to disable partial raster in renderer

cc/tiles/tile_manager.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/tiles/tile_manager.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 169 matching lines @@
                     base::saturated_cast<int>(stats.completed_count));
   state->SetInteger("canceled_count",
                     base::saturated_cast<int>(stats.canceled_count));
   return state;
 }
 
 // static
 scoped_ptr<TileManager> TileManager::Create(
     TileManagerClient* client,
     base::SequencedTaskRunner* task_runner,
-    size_t scheduled_raster_task_limit) {
-  return make_scoped_ptr(
-      new TileManager(client, task_runner, scheduled_raster_task_limit));
+    size_t scheduled_raster_task_limit,
+    bool use_partial_raster) {
+  return make_scoped_ptr(new TileManager(
+      client, task_runner, scheduled_raster_task_limit, use_partial_raster));
 }
 
 TileManager::TileManager(
     TileManagerClient* client,
     const scoped_refptr<base::SequencedTaskRunner>& task_runner,
-    size_t scheduled_raster_task_limit)
+    size_t scheduled_raster_task_limit,
+    bool use_partial_raster)
     : client_(client),
       task_runner_(task_runner),
       resource_pool_(nullptr),
       tile_task_runner_(nullptr),
       scheduled_raster_task_limit_(scheduled_raster_task_limit),
+      use_partial_raster_(use_partial_raster),
       all_tiles_that_need_to_be_rasterized_are_scheduled_(true),
       did_check_for_completed_tasks_since_last_schedule_tasks_(true),
       did_oom_on_last_assign_(false),
       more_tiles_need_prepare_check_notifier_(
           task_runner_.get(),
           base::Bind(&TileManager::CheckIfMoreTilesNeedToBePrepared,
                      base::Unretained(this))),
       signals_check_notifier_(task_runner_.get(),
                               base::Bind(&TileManager::CheckAndIssueSignals,
                                          base::Unretained(this))),
@@ skipping 438 matching lines @@
   orphan_raster_tasks_.clear();
 
   did_check_for_completed_tasks_since_last_schedule_tasks_ = false;
 }
 
 scoped_refptr<RasterTask> TileManager::CreateRasterTask(
     const PrioritizedTile& prioritized_tile) {
   Tile* tile = prioritized_tile.tile();
   uint64_t resource_content_id = 0;
   Resource* resource = nullptr;
-  if (tile->invalidated_id()) {
+  if (use_partial_raster_ && tile->invalidated_id()) {
     // TODO(danakj): For resources that are in use, we should still grab them
     // and copy from them instead of rastering everything. crbug.com/492754
     resource =
         resource_pool_->TryAcquireResourceWithContentId(tile->invalidated_id());
   }
   if (resource) {
     resource_content_id = tile->invalidated_id();
     DCHECK_EQ(DetermineResourceFormat(tile), resource->format());
     DCHECK_EQ(tile->desired_texture_size().ToString(),
               resource->size().ToString());
@@ skipping 329 matching lines @@
 void TileManager::Signals::reset() {
   ready_to_activate = false;
   did_notify_ready_to_activate = false;
   ready_to_draw = false;
   did_notify_ready_to_draw = false;
   all_tile_tasks_completed = false;
   did_notify_all_tile_tasks_completed = false;
 }
 
 }  // namespace cc