Share animations from compositor to main thread.

cc/layers/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/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/json/json_reader.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
+#include "cc/animation/animation_host.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/mutable_properties.h"
 #include "cc/base/math_util.h"
 #include "cc/base/simple_enclosed_region.h"
 #include "cc/debug/debug_colors.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/debug/micro_benchmark_impl.h"
 #include "cc/debug/traced_value.h"
 #include "cc/input/main_thread_scrolling_reason.h"
 #include "cc/input/scroll_state.h"
@@ skipping 465 matching lines @@
 }
 
 skia::RefPtr<SkPicture> LayerImpl::GetPicture() {
   return skia::RefPtr<SkPicture>();
 }
 
 scoped_ptr<LayerImpl> LayerImpl::CreateLayerImpl(LayerTreeImpl* tree_impl) {
   return LayerImpl::Create(tree_impl, layer_id_, scroll_offset_);
 }
 
+void LayerImpl::set_main_thread_scrolling_reasons(
+    uint32_t main_thread_scrolling_reasons) {
+  if (main_thread_scrolling_reasons_ == main_thread_scrolling_reasons)
+    return;
+
+  if (main_thread_scrolling_reasons &
+          MainThreadScrollingReason::kHasNonLayerViewportConstrainedObjects &&
+      layer_tree_impl()) {
+    if (layer_tree_impl()->ScrollOffsetIsAnimatingOnImplOnly(this)) {
+      layer_tree_impl()->animation_host()->ScrollAnimationAbort(
+          true /* needs_completion */);
+    } else if (layer_animation_controller()) {
+      layer_animation_controller()->AbortAnimations(

[ajuma, 2016/02/26 23:56:54]

Shouldn't this be only if the animations are impl-only? That said, the old
animation code path is close to being deleted (see crbug.com/575041), so this
might not end up mattering by the time this lands.

[ymalik, 2016/02/29 16:31:09]

Yes, you're right. I am removing it though, since I don't have the takeover
pluming for the old path anyway.

+          TargetProperty::SCROLL_OFFSET, true /* needs_completion */);
+    }
+  }
+
+  main_thread_scrolling_reasons_ = main_thread_scrolling_reasons;
+}
+
 void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   layer->SetTransformOrigin(transform_origin_);
   layer->SetBackgroundColor(background_color_);
   layer->SetBounds(bounds_);
   layer->SetDoubleSided(double_sided_);
   layer->SetDrawsContent(DrawsContent());
   layer->SetHideLayerAndSubtree(hide_layer_and_subtree_);
   // If whether layer has render surface changes, we need to update draw
   // properties.
   // TODO(weiliangc): Should be safely removed after impl side is able to
@@ skipping 1266 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc