cc: Add checker-imaging support to TileManager.

cc/layers/picture_layer_impl.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_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1349 matching lines @@
 
 bool PictureLayerImpl::IsOnActiveOrPendingTree() const {
   return !layer_tree_impl()->IsRecycleTree();
 }
 
 bool PictureLayerImpl::HasValidTilePriorities() const {
   return IsOnActiveOrPendingTree() &&
          is_drawn_render_surface_layer_list_member();
 }
 
+void PictureLayerImpl::InvalidateRegionForImages(
+    const std::unordered_set<ImageId>& images_to_invalidate) {
+  TRACE_EVENT_BEGIN0("cc", "PictureLayerImpl::InvalidateRegionForImages");
+
+  InvalidationRegion image_invalidation;
+  for (auto image_id : images_to_invalidate)
+    image_invalidation.Union(raster_source_->GetRectForImage(image_id));
+  Region invalidation;
+  image_invalidation.Swap(&invalidation);
+
+  TRACE_EVENT_END1("cc", "PictureLayerImpl::InvalidateRegionForImages",

[vmpstr, 2017/02/13 22:49:30]

Hmm, this doesn't capture the duration of the
Union/UpdateTilingsForImplSideInvalidation though. Can we move the end trace in
both the early out and at the end of the function?

[Khushal, 2017/02/14 05:10:22]

Done.

+                   "Invalidation", invalidation.ToString());
+
+  if (invalidation.IsEmpty())
+    return;
+  invalidation_.Union(invalidation);
+  tilings_->UpdateTilingsForImplSideInvalidation(invalidation);
+  SetNeedsPushProperties();
+}
+
 }  // namespace cc