Update from https://crrev.com/314320

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
-#include "base/debug/trace_event_argument.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event_argument.h"
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/scroll_offset_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/animation/timing_function.h"
 #include "cc/base/latency_info_swap_promise_monitor.h"
 #include "cc/base/math_util.h"
 #include "cc/base/util.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/debug/debug_rect_history.h"
 #include "cc/debug/devtools_instrumentation.h"
@@ skipping 54 matching lines @@
 namespace cc {
 namespace {
 
 // Small helper class that saves the current viewport location as the user sees
 // it and resets to the same location.
 class ViewportAnchor {
  public:
   ViewportAnchor(LayerImpl* inner_scroll, LayerImpl* outer_scroll)
   : inner_(inner_scroll),
     outer_(outer_scroll) {
-    viewport_in_content_coordinates_ = inner_->TotalScrollOffset();
+    viewport_in_content_coordinates_ = inner_->CurrentScrollOffset();
 
     if (outer_)
-      viewport_in_content_coordinates_ += outer_->TotalScrollOffset();
+      viewport_in_content_coordinates_ += outer_->CurrentScrollOffset();
   }
 
   void ResetViewportToAnchoredPosition() {
     DCHECK(outer_);
 
     inner_->ClampScrollToMaxScrollOffset();
     outer_->ClampScrollToMaxScrollOffset();
 
-    gfx::ScrollOffset viewport_location = inner_->TotalScrollOffset() +
-                                          outer_->TotalScrollOffset();
+    gfx::ScrollOffset viewport_location =
+        inner_->CurrentScrollOffset() + outer_->CurrentScrollOffset();
 
     gfx::Vector2dF delta =
         viewport_in_content_coordinates_.DeltaFrom(viewport_location);
 
     delta = outer_->ScrollBy(delta);
     inner_->ScrollBy(delta);
   }
 
  private:
   LayerImpl* inner_;
@@ skipping 107 matching lines @@
       device_scale_factor_(1.f),
       resourceless_software_draw_(false),
       begin_impl_frame_interval_(BeginFrameArgs::DefaultInterval()),
       animation_registrar_(AnimationRegistrar::Create()),
       rendering_stats_instrumentation_(rendering_stats_instrumentation),
       micro_benchmark_controller_(this),
       shared_bitmap_manager_(shared_bitmap_manager),
       gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
       id_(id),
       requires_high_res_to_draw_(false),
-      required_for_draw_tile_is_top_of_raster_queue_(false) {
+      is_likely_to_require_a_draw_(false) {
   DCHECK(proxy_->IsImplThread());
   DidVisibilityChange(this, visible_);
   animation_registrar_->set_supports_scroll_animations(
       proxy_->SupportsImplScrolling());
 
   SetDebugState(settings.initial_debug_state);
 
   // LTHI always has an active tree.
   active_tree_ = LayerTreeImpl::create(this, new SyncedProperty<ScaleGroup>(),
                                        new SyncedElasticOverscroll);
@@ skipping 55 matching lines @@
   if (!settings_.impl_side_painting && output_surface_)
     output_surface_->ForceReclaimResources();
 
   if (UsePendingTreeForSync())
     CreatePendingTree();
 }
 
 void LayerTreeHostImpl::CommitComplete() {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::CommitComplete");
 
-  if (pending_tree_)
-    pending_tree_->ApplyScrollDeltasSinceBeginMainFrame();
   sync_tree()->set_needs_update_draw_properties();
 
   if (settings_.impl_side_painting) {
     // Impl-side painting needs an update immediately post-commit to have the
     // opportunity to create tilings.  Other paths can call UpdateDrawProperties
     // more lazily when needed prior to drawing.
     sync_tree()->UpdateDrawProperties();
     // Start working on newly created tiles immediately if needed.
     if (tile_manager_ && tile_priorities_dirty_)
       PrepareTiles();
@@ skipping 132 matching lines @@
 
   LayerImpl* layer_impl =
       active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
 
   bool scroll_on_main_thread = false;
   LayerImpl* scrolling_layer_impl = FindScrollLayerForDeviceViewportPoint(
       device_viewport_point, type, layer_impl, &scroll_on_main_thread, NULL);
   return CurrentlyScrollingLayer() == scrolling_layer_impl;
 }
 
+bool LayerTreeHostImpl::HaveWheelEventHandlersAt(
+    const gfx::Point& viewport_point) {
+  gfx::PointF device_viewport_point =
+      gfx::ScalePoint(viewport_point, device_scale_factor_);
+
+  LayerImpl* layer_impl =
+      active_tree_->FindLayerWithWheelHandlerThatIsHitByPoint(
+          device_viewport_point);
+
+  return layer_impl != NULL;
+}
+
 bool LayerTreeHostImpl::HaveTouchEventHandlersAt(
     const gfx::Point& viewport_point) {
 
   gfx::PointF device_viewport_point =
       gfx::ScalePoint(viewport_point, device_scale_factor_);
 
   LayerImpl* layer_impl =
       active_tree_->FindLayerThatIsHitByPointInTouchHandlerRegion(
           device_viewport_point);
 
@@ skipping 273 matching lines @@
            LayerIteratorType::Begin(frame->render_surface_layer_list);
        it != end;
        ++it) {
     RenderPassId target_render_pass_id =
         it.target_render_surface_layer()->render_surface()->GetRenderPassId();
     RenderPass* target_render_pass =
         frame->render_passes_by_id[target_render_pass_id];
 
     occlusion_tracker.EnterLayer(it);
 
-    AppendQuadsData append_quads_data(target_render_pass_id);
+    AppendQuadsData append_quads_data;
 
     if (it.represents_target_render_surface()) {
       if (it->HasCopyRequest()) {
         have_copy_request = true;
         it->TakeCopyRequestsAndTransformToTarget(
             &target_render_pass->copy_requests);
       }
     } else if (it.represents_contributing_render_surface() &&
                it->render_surface()->contributes_to_drawn_surface()) {
       RenderPassId contributing_render_pass_id =
@@ skipping 16 matching lines @@
         frame->will_draw_layers.push_back(*it);
 
         if (it->HasContributingDelegatedRenderPasses()) {
           RenderPassId contributing_render_pass_id =
               it->FirstContributingRenderPassId();
           while (frame->render_passes_by_id.find(contributing_render_pass_id) !=
                  frame->render_passes_by_id.end()) {
             RenderPass* render_pass =
                 frame->render_passes_by_id[contributing_render_pass_id];
 
-            AppendQuadsData append_quads_data(render_pass->id);
             AppendQuadsForLayer(render_pass,
                                 *it,
                                 occlusion_tracker,
                                 &append_quads_data);
 
             contributing_render_pass_id =
                 it->NextContributingRenderPassId(contributing_render_pass_id);
           }
         }
 
@@ skipping 390 matching lines @@
     }
   }
 }
 
 scoped_ptr<RasterTilePriorityQueue> LayerTreeHostImpl::BuildRasterQueue(
     TreePriority tree_priority,
     RasterTilePriorityQueue::Type type) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::BuildRasterQueue");
   picture_layer_pairs_.clear();
   GetPictureLayerImplPairs(&picture_layer_pairs_, true);
-  scoped_ptr<RasterTilePriorityQueue> queue(RasterTilePriorityQueue::Create(
-      picture_layer_pairs_, tree_priority, type));
-
-  if (!queue->IsEmpty()) {
-    // Only checking the Top() tile here isn't a definite answer that there is
-    // or isn't something required for draw in this raster queue. It's just a
-    // heuristic to let us hit the common case and proactively tell the
-    // scheduler that we expect to draw within each vsync until we get all the
-    // tiles ready to draw. If we happen to miss a required for draw tile here,
-    // then we will miss telling the scheduler each frame that we intend to draw
-    // so it may make worse scheduling decisions.
-    required_for_draw_tile_is_top_of_raster_queue_ =
-        queue->Top()->required_for_draw();
-  } else {
-    required_for_draw_tile_is_top_of_raster_queue_ = false;
-  }
-  return queue;
+  return RasterTilePriorityQueue::Create(picture_layer_pairs_, tree_priority,
+                                         type);
 }
 
 scoped_ptr<EvictionTilePriorityQueue> LayerTreeHostImpl::BuildEvictionQueue(
     TreePriority tree_priority) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::BuildEvictionQueue");
   scoped_ptr<EvictionTilePriorityQueue> queue(new EvictionTilePriorityQueue);
   picture_layer_pairs_.clear();
   GetPictureLayerImplPairs(&picture_layer_pairs_, false);
   queue->Build(picture_layer_pairs_, tree_priority);
   return queue;
 }
 
+void LayerTreeHostImpl::SetIsLikelyToRequireADraw(
+    bool is_likely_to_require_a_draw) {
+  // Proactively tell the scheduler that we expect to draw within each vsync
+  // until we get all the tiles ready to draw. If we happen to miss a required
+  // for draw tile here, then we will miss telling the scheduler each frame that
+  // we intend to draw so it may make worse scheduling decisions.
+  is_likely_to_require_a_draw_ = is_likely_to_require_a_draw;
+}
+
 const std::vector<PictureLayerImpl*>& LayerTreeHostImpl::GetPictureLayers()
     const {
   return picture_layers_;
 }
 
 void LayerTreeHostImpl::NotifyReadyToActivate() {
   client_->NotifyReadyToActivate();
 }
 
 void LayerTreeHostImpl::NotifyReadyToDraw() {
   // Tiles that are ready will cause NotifyTileStateChanged() to be called so we
   // don't need to schedule a draw here. Just stop WillBeginImplFrame() from
   // causing optimistic requests to draw a frame.
-  required_for_draw_tile_is_top_of_raster_queue_ = false;
+  is_likely_to_require_a_draw_ = false;
 
   client_->NotifyReadyToDraw();
 }
 
 void LayerTreeHostImpl::NotifyTileStateChanged(const Tile* tile) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::NotifyTileStateChanged");
 
   if (active_tree_) {
     LayerImpl* layer_impl =
         active_tree_->FindActiveTreeLayerById(tile->layer_id());
@@ skipping 349 matching lines @@
   return true;
 }
 
 void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
   // Sample the frame time now. This time will be used for updating animations
   // when we draw.
   UpdateCurrentBeginFrameArgs(args);
   // Cache the begin impl frame interval
   begin_impl_frame_interval_ = args.interval;
 
-  if (required_for_draw_tile_is_top_of_raster_queue_) {
-    // Optimistically schedule a draw, as a tile required for draw is at the top
-    // of the current raster queue. This will let us expect the tile to complete
-    // and draw it within the impl frame we are beginning now.
+  if (is_likely_to_require_a_draw_) {
+    // Optimistically schedule a draw. This will let us expect the tile manager
+    // to complete its work so that we can draw new tiles within the impl frame
+    // we are beginning now.
     SetNeedsRedraw();
   }
 }
 
 void LayerTreeHostImpl::UpdateViewportContainerSizes() {
   LayerImpl* inner_container = active_tree_->InnerViewportContainerLayer();
   LayerImpl* outer_container = active_tree_->OuterViewportContainerLayer();
 
   if (!inner_container || !top_controls_manager_)
     return;
@@ skipping 320 matching lines @@
                           tile_task_worker_pool_->AsTileTaskRunner(),
                           rasterizer_.get(), scheduled_raster_task_limit);
 
   UpdateTileManagerMemoryPolicy(ActualManagedMemoryPolicy());
 }
 
 scoped_ptr<Rasterizer> LayerTreeHostImpl::CreateRasterizer() {
   ContextProvider* context_provider = output_surface_->context_provider();
   if (use_gpu_rasterization_ && context_provider) {
     return GpuRasterizer::Create(context_provider, resource_provider_.get(),
-                                 settings_.use_distance_field_text, false);
+                                 settings_.use_distance_field_text, false,
+                                 settings_.gpu_rasterization_msaa_sample_count);
   }
   return SoftwareRasterizer::Create();
 }
 
 void LayerTreeHostImpl::CreateResourceAndTileTaskWorkerPool(
     scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
     scoped_ptr<ResourcePool>* resource_pool,
     scoped_ptr<ResourcePool>* staging_resource_pool) {
   base::SingleThreadTaskRunner* task_runner =
       proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
@@ skipping 424 matching lines @@
   // behavior as ScrollBy to determine which layer to animate, but we do not
   // do the Android-specific things in ScrollBy like showing top controls.
   InputHandler::ScrollStatus scroll_status = ScrollBegin(viewport_point, Wheel);
   if (scroll_status == ScrollStarted) {
     gfx::Vector2dF pending_delta = scroll_delta;
     for (LayerImpl* layer_impl = CurrentlyScrollingLayer(); layer_impl;
          layer_impl = layer_impl->parent()) {
       if (!layer_impl->scrollable())
         continue;
 
-      gfx::ScrollOffset current_offset = layer_impl->TotalScrollOffset();
+      gfx::ScrollOffset current_offset = layer_impl->CurrentScrollOffset();
       gfx::ScrollOffset target_offset =
           ScrollOffsetWithDelta(current_offset, pending_delta);
       target_offset.SetToMax(gfx::ScrollOffset());
       target_offset.SetToMin(layer_impl->MaxScrollOffset());
       gfx::Vector2dF actual_delta = target_offset.DeltaFrom(current_offset);
 
       const float kEpsilon = 0.1f;
       bool can_layer_scroll = (std::abs(actual_delta.x()) > kEpsilon ||
                                std::abs(actual_delta.y()) > kEpsilon);
 
@@ skipping 69 matching lines @@
     return gfx::Vector2dF();
 
   // local_start_point and local_end_point are in content space but we want to
   // move them to layer space for scrolling.
   float width_scale = 1.f / layer_impl->contents_scale_x();
   float height_scale = 1.f / layer_impl->contents_scale_y();
   local_start_point.Scale(width_scale, height_scale);
   local_end_point.Scale(width_scale, height_scale);
 
   // Apply the scroll delta.
-  gfx::Vector2dF previous_delta = layer_impl->ScrollDelta();
+  gfx::ScrollOffset previous_offset = layer_impl->CurrentScrollOffset();
   layer_impl->ScrollBy(local_end_point - local_start_point);
+  gfx::ScrollOffset scrolled =
+      layer_impl->CurrentScrollOffset() - previous_offset;
 
   // Get the end point in the layer's content space so we can apply its
   // ScreenSpaceTransform.
-  gfx::PointF actual_local_end_point = local_start_point +
-                                       layer_impl->ScrollDelta() -
-                                       previous_delta;
+  gfx::PointF actual_local_end_point =
+      local_start_point + gfx::Vector2dF(scrolled.x(), scrolled.y());
   gfx::PointF actual_local_content_end_point =
       gfx::ScalePoint(actual_local_end_point,
                       1.f / width_scale,
                       1.f / height_scale);
 
   // Calculate the applied scroll delta in viewport space coordinates.
   gfx::PointF actual_screen_space_end_point =
       MathUtil::MapPoint(layer_impl->screen_space_transform(),
                          actual_local_content_end_point,
                          &end_clipped);
   DCHECK(!end_clipped);
   if (end_clipped)
     return gfx::Vector2dF();
   gfx::PointF actual_viewport_end_point =
       gfx::ScalePoint(actual_screen_space_end_point,
                       1.f / scale_from_viewport_to_screen_space);
   return actual_viewport_end_point - viewport_point;
 }
 
 static gfx::Vector2dF ScrollLayerWithLocalDelta(
     LayerImpl* layer_impl,
     const gfx::Vector2dF& local_delta,
     float page_scale_factor) {
-  gfx::Vector2dF previous_delta(layer_impl->ScrollDelta());
+  gfx::ScrollOffset previous_offset = layer_impl->CurrentScrollOffset();
   gfx::Vector2dF delta = local_delta;
   delta.Scale(1.f / page_scale_factor);
   layer_impl->ScrollBy(delta);
-  return layer_impl->ScrollDelta() - previous_delta;
+  gfx::ScrollOffset scrolled =
+      layer_impl->CurrentScrollOffset() - previous_offset;
+  return gfx::Vector2dF(scrolled.x(), scrolled.y());
 }
 
 bool LayerTreeHostImpl::ShouldTopControlsConsumeScroll(
     const gfx::Vector2dF& scroll_delta) const {
   DCHECK(CurrentlyScrollingLayer());
 
   if (!top_controls_manager_)
     return false;
 
   // Always consume if it's in the direction to show the top controls.
@@ skipping 429 matching lines @@
   // scales that we want when we're not inside a pinch.
   active_tree_->set_needs_update_draw_properties();
   SetNeedsRedraw();
 }
 
 static void CollectScrollDeltas(ScrollAndScaleSet* scroll_info,
                                 LayerImpl* layer_impl) {
   if (!layer_impl)
     return;
 
-  gfx::Vector2d scroll_delta =
-      gfx::ToFlooredVector2d(layer_impl->ScrollDelta());
+  gfx::ScrollOffset scroll_delta = layer_impl->PullDeltaForMainThread();
+
   if (!scroll_delta.IsZero()) {
     LayerTreeHostCommon::ScrollUpdateInfo scroll;
     scroll.layer_id = layer_impl->id();
-    scroll.scroll_delta = scroll_delta;
+    scroll.scroll_delta = gfx::Vector2d(scroll_delta.x(), scroll_delta.y());
     scroll_info->scrolls.push_back(scroll);
-    layer_impl->SetSentScrollDelta(scroll_delta);
   }
 
   for (size_t i = 0; i < layer_impl->children().size(); ++i)
     CollectScrollDeltas(scroll_info, layer_impl->children()[i]);
 }
 
 scoped_ptr<ScrollAndScaleSet> LayerTreeHostImpl::ProcessScrollDeltas() {
   scoped_ptr<ScrollAndScaleSet> scroll_info(new ScrollAndScaleSet());
 
   CollectScrollDeltas(scroll_info.get(), active_tree_->root_layer());
@@ skipping 456 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc