[Master/Overview CL] Make PageScaleFactor work for oopif subframe.

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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 226 matching lines @@
   DCHECK(mutator_host_);
   mutator_host_->SetMutatorHostClient(this);
 
   DCHECK(task_runner_provider_->IsImplThread());
   DidVisibilityChange(this, visible_);
 
   SetDebugState(settings.initial_debug_state);
 
   // LTHI always has an active tree.
   active_tree_ = base::MakeUnique<LayerTreeImpl>(
-      this, new SyncedProperty<ScaleGroup>, new SyncedBrowserControls,
-      new SyncedElasticOverscroll);
+      this, new SyncedProperty<ScaleGroup>, new SyncedProperty<ScaleGroup>,
+      new SyncedBrowserControls, new SyncedElasticOverscroll);
   active_tree_->property_trees()->is_active = true;
 
   viewport_ = Viewport::Create(this);
 
   TRACE_EVENT_OBJECT_CREATED_WITH_ID(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
                                      "cc::LayerTreeHostImpl", id_);
 
   browser_controls_offset_manager_ = BrowserControlsOffsetManager::Create(
       this, settings.top_controls_show_threshold,
       settings.top_controls_hide_threshold);
@@ skipping 916 matching lines @@
   UpdateTileManagerMemoryPolicy(ManagedMemoryPolicy(0));
 }
 
 void LayerTreeHostImpl::BlockNotifyReadyToActivateForTesting(bool block) {
   NOTREACHED();
 }
 
 void LayerTreeHostImpl::ResetTreesForTesting() {
   if (active_tree_)
     active_tree_->DetachLayers();
-  active_tree_ =
-      base::MakeUnique<LayerTreeImpl>(this, active_tree()->page_scale_factor(),
-                                      active_tree()->top_controls_shown_ratio(),
-                                      active_tree()->elastic_overscroll());
+  active_tree_ = base::MakeUnique<LayerTreeImpl>(
+      this, active_tree()->page_scale_factor(),
+      active_tree()->subframe_page_scale_factor(),
+      active_tree()->top_controls_shown_ratio(),
+      active_tree()->elastic_overscroll());
   active_tree_->property_trees()->is_active = true;
   if (pending_tree_)
     pending_tree_->DetachLayers();
   pending_tree_ = nullptr;
   pending_tree_duration_timer_ = nullptr;
   if (recycle_tree_)
     recycle_tree_->DetachLayers();
   recycle_tree_ = nullptr;
 }
 
@@ skipping 320 matching lines @@
 void LayerTreeHostImpl::OnCanDrawStateChangedForTree() {
   client_->OnCanDrawStateChanged(CanDraw());
 }
 
 CompositorFrameMetadata LayerTreeHostImpl::MakeCompositorFrameMetadata() const {
   CompositorFrameMetadata metadata;
   metadata.device_scale_factor = active_tree_->painted_device_scale_factor() *
                                  active_tree_->device_scale_factor();
 
   metadata.page_scale_factor = active_tree_->current_page_scale_factor();
+  // TODO(wjmaclean): Should we expose subframe PSF here?
   metadata.scrollable_viewport_size = active_tree_->ScrollableViewportSize();
   metadata.root_layer_size = active_tree_->ScrollableSize();
   metadata.min_page_scale_factor = active_tree_->min_page_scale_factor();
   metadata.max_page_scale_factor = active_tree_->max_page_scale_factor();
   metadata.top_controls_height =
       browser_controls_offset_manager_->TopControlsHeight();
   metadata.top_controls_shown_ratio =
       browser_controls_offset_manager_->TopControlsShownRatio();
   metadata.bottom_controls_height =
       browser_controls_offset_manager_->BottomControlsHeight();
@@ skipping 384 matching lines @@
   return did_lock_scrolling_layer_;
 }
 
 void LayerTreeHostImpl::CreatePendingTree() {
   CHECK(!pending_tree_);
   if (recycle_tree_) {
     recycle_tree_.swap(pending_tree_);
   } else {
     pending_tree_ = base::MakeUnique<LayerTreeImpl>(
         this, active_tree()->page_scale_factor(),
+        active_tree()->subframe_page_scale_factor(),
         active_tree()->top_controls_shown_ratio(),
         active_tree()->elastic_overscroll());
   }
 
   client_->OnCanDrawStateChanged(CanDraw());
   TRACE_EVENT_ASYNC_BEGIN0("cc", "PendingTree:waiting", pending_tree_.get());
 
   DCHECK(!pending_tree_duration_timer_);
   pending_tree_duration_timer_.reset(new PendingTreeDurationHistogramTimer());
 }
@@ skipping 1341 matching lines @@
   pinch_gesture_active_ = true;
   client_->RenewTreePriority();
   pinch_gesture_end_should_clear_scrolling_layer_ = !CurrentlyScrollingLayer();
   active_tree_->SetCurrentlyScrollingLayer(viewport()->MainScrollLayer());
   browser_controls_offset_manager_->PinchBegin();
 }
 
 void LayerTreeHostImpl::PinchGestureUpdate(float magnify_delta,
                                            const gfx::Point& anchor) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::PinchGestureUpdate");
-  if (!InnerViewportScrollLayer())
-    return;
-  viewport()->PinchUpdate(magnify_delta, anchor);
+  if (InnerViewportScrollLayer()) {
+    viewport()->PinchUpdate(magnify_delta, anchor);
+  } else {
+    float subframe_page_scale = active_tree_->GetSubframePageScaleFactor();
+    subframe_page_scale *= magnify_delta;
+    active_tree_->SetSubframePageScaleOnActiveTree(subframe_page_scale);
+  }
   client_->SetNeedsCommitOnImplThread();
   SetNeedsRedraw();
   client_->RenewTreePriority();
   // Pinching can change the root scroll offset, so inform the synchronous input
   // handler.
   UpdateRootLayerStateForSynchronousInputHandler();
 }
 
 void LayerTreeHostImpl::PinchGestureEnd() {
   pinch_gesture_active_ = false;
@@ skipping 778 matching lines @@
   if (is_visible) {
     worker_context_visibility_ =
         worker_context->CacheController()->ClientBecameVisible();
   } else {
     worker_context->CacheController()->ClientBecameNotVisible(
         std::move(worker_context_visibility_));
   }
 }
 
 }  // namespace cc