cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/tile_manager.cc

Index: cc/tile_manager.cc
diff --git a/cc/tile_manager.cc b/cc/tile_manager.cc
index 8b49b15a75226e899e2a29543d5b4a05c94f1b9b..6cd86ba28d1929e002bed5dfd20c8074d6888494 100644
--- a/cc/tile_manager.cc
+++ b/cc/tile_manager.cc
@@ -192,6 +192,7 @@ TileManager::TileManager(
     TileManagerClient* client,
     ResourceProvider* resource_provider,
     size_t num_raster_threads,
+    RenderingStatsRecorder* rendering_stats_recorder,
     bool use_cheapness_estimator,
     bool use_color_estimator,
     bool prediction_benchmarking)
@@ -203,7 +204,7 @@ TileManager::TileManager(
       bytes_pending_upload_(0),
       has_performed_uploads_since_last_flush_(false),
       ever_exceeded_memory_budget_(false),
-      record_rendering_stats_(false),
+      rendering_stats_recorder_(rendering_stats_recorder),
       use_cheapness_estimator_(use_cheapness_estimator),
       use_color_estimator_(use_color_estimator),
       allow_cheap_tasks_(true),
@@ -528,24 +529,6 @@ scoped_ptr<base::Value> TileManager::GetMemoryRequirementsAsValue() const {
   return requirements.PassAs<base::Value>();
 }
 
-void TileManager::SetRecordRenderingStats(bool record_rendering_stats) {
-  if (record_rendering_stats_ == record_rendering_stats)
-    return;
-
-  record_rendering_stats_ = record_rendering_stats;
-  raster_worker_pool_->SetRecordRenderingStats(record_rendering_stats);
-}
-
-void TileManager::GetRenderingStats(RenderingStats* stats) {
-  CHECK(record_rendering_stats_);
-  raster_worker_pool_->GetRenderingStats(stats);
-  stats->totalDeferredImageCacheHitCount =
-      rendering_stats_.totalDeferredImageCacheHitCount;
-  stats->totalImageGatheringCount = rendering_stats_.totalImageGatheringCount;
-  stats->totalImageGatheringTime =
-      rendering_stats_.totalImageGatheringTime;
-}
-
 bool TileManager::HasPendingWorkScheduled(WhichTree tree) const {
   // Always true when ManageTiles() call is pending.
   if (manage_tiles_pending_)
@@ -758,19 +741,15 @@ void TileManager::GatherPixelRefsForTile(Tile* tile) {
   TRACE_EVENT0("cc", "TileManager::GatherPixelRefsForTile");
   ManagedTileState& managed_tile_state = tile->managed_state();
   if (managed_tile_state.need_to_gather_pixel_refs) {
-    base::TimeTicks gather_begin_time;
-    if (record_rendering_stats_)
-      gather_begin_time = base::TimeTicks::HighResNow();
+    base::TimeTicks start_time = rendering_stats_recorder_->StartRecording();
     tile->picture_pile()->GatherPixelRefs(
         tile->content_rect_,
         tile->contents_scale_,
         managed_tile_state.pending_pixel_refs);
     managed_tile_state.need_to_gather_pixel_refs = false;
-    if (record_rendering_stats_) {
-      rendering_stats_.totalImageGatheringCount++;
-      rendering_stats_.totalImageGatheringTime +=
-          base::TimeTicks::HighResNow() - gather_begin_time;
-    }
+    base::TimeDelta duration =
+        rendering_stats_recorder_->EndRecording(start_time);
+    rendering_stats_recorder_->AddImageGathering(duration);
   }
 }
 
@@ -787,7 +766,7 @@ void TileManager::DispatchImageDecodeTasksForTile(Tile* tile) {
     }
     // TODO(qinmin): passing correct image size to PrepareToDecode().
     if ((*it)->PrepareToDecode(skia::LazyPixelRef::PrepareParams())) {
-      rendering_stats_.totalDeferredImageCacheHitCount++;
+      rendering_stats_recorder_->IncrementDeferredImageCacheHitCount();
       pending_pixel_refs.erase(it++);
     } else {
       if (pending_tasks_ >= max_pending_tasks_)
@@ -807,7 +786,9 @@ void TileManager::DispatchOneImageDecodeTask(
   pending_decode_tasks_[pixel_ref_id] = pixel_ref;
 
   raster_worker_pool_->PostTaskAndReply(
-      base::Bind(&TileManager::RunImageDecodeTask, pixel_ref),
+      base::Bind(&TileManager::RunImageDecodeTask,
+                 pixel_ref,
+                 rendering_stats_recorder_),
       base::Bind(&TileManager::OnImageDecodeTaskCompleted,
                  base::Unretained(this),
                  tile,
@@ -871,7 +852,8 @@ void TileManager::DispatchOneRasterTask(scoped_refptr<Tile> tile) {
                  buffer,
                  tile->content_rect(),
                  tile->contents_scale(),
-                 GetRasterTaskMetadata(*tile)),
+                 GetRasterTaskMetadata(*tile),
+                 rendering_stats_recorder_),
       base::Bind(&TileManager::OnRasterTaskCompleted,
                  base::Unretained(this),
                  tile,
@@ -987,12 +969,13 @@ void TileManager::DidTileTreeBinChange(Tile* tile,
 }
 
 // static
-void TileManager::RunRasterTask(uint8* buffer,
-                                const gfx::Rect& rect,
-                                float contents_scale,
-                                const RasterTaskMetadata& metadata,
-                                PicturePileImpl* picture_pile,
-                                RenderingStats* stats) {
+void TileManager::RunRasterTask(
+    uint8* buffer,
+    const gfx::Rect& rect,
+    float contents_scale,
+    const RasterTaskMetadata& metadata,
+    RenderingStatsRecorder* stats_recorder,
+    PicturePileImpl* picture_pile) {
   TRACE_EVENT2(
       "cc", "TileManager::RunRasterTask",
       "is_on_pending_tree",
@@ -1010,22 +993,16 @@ void TileManager::RunRasterTask(uint8* buffer,
   SkDevice device(bitmap);
   SkCanvas canvas(&device);
 
-  base::TimeTicks begin_time;
-  if (stats)
-    begin_time = base::TimeTicks::HighResNow();
+  base::TimeTicks start_time = stats_recorder->StartRecording();
 
   int64 total_pixels_rasterized = 0;
   picture_pile->Raster(&canvas, rect, contents_scale,
                        &total_pixels_rasterized);
 
-  if (stats) {
-    stats->totalPixelsRasterized += total_pixels_rasterized;
+  base::TimeDelta duration = stats_recorder->EndRecording(start_time);
 
-    base::TimeTicks end_time = base::TimeTicks::HighResNow();
-    base::TimeDelta duration = end_time - begin_time;
-    stats->totalRasterizeTime += duration;
-    if (metadata.is_tile_in_pending_tree_now_bin)
-      stats->totalRasterizeTimeForNowBinsOnPendingTree += duration;
+  if (stats_recorder->record_rendering_stats()) {
+    stats_recorder->AddRaster(duration, total_pixels_rasterized, metadata.is_tile_in_pending_tree_now_bin);
 
     UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.PictureRasterTimeMS",
                                 duration.InMilliseconds(),
@@ -1118,18 +1095,14 @@ void TileManager::RecordSolidColorPredictorResults(
 }
 
 // static
-void TileManager::RunImageDecodeTask(skia::LazyPixelRef* pixel_ref,
-                                     RenderingStats* stats) {
+void TileManager::RunImageDecodeTask(
+    skia::LazyPixelRef* pixel_ref,
+    RenderingStatsRecorder* stats_recorder) {
   TRACE_EVENT0("cc", "TileManager::RunImageDecodeTask");
-  base::TimeTicks decode_begin_time;
-  if (stats)
-    decode_begin_time = base::TimeTicks::HighResNow();
+  base::TimeTicks start_time = stats_recorder->StartRecording();
   pixel_ref->Decode();
-  if (stats) {
-    stats->totalDeferredImageDecodeCount++;
-    stats->totalDeferredImageDecodeTime +=
-        base::TimeTicks::HighResNow() - decode_begin_time;
-  }
+  base::TimeDelta duration = stats_recorder->EndRecording(start_time);
+  stats_recorder->AddDeferredImageDecode(duration);
 }
 
 }  // namespace cc