Revert of Snap RWHVA and resize the legacy window on Windows whenever the ancestor window's bounds change.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
-#include <set>
-
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/layers/layer.h"
@@ skipping 328 matching lines @@
     if (window == view_->window_)
       view_->AddedToRootWindow();
   }
 
   void OnWindowRemovingFromRootWindow(aura::Window* window,
                                       aura::Window* new_root) override {
     if (window == view_->window_)
       view_->RemovingFromRootWindow();
   }
 
-  void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override {
-    view_->ParentHierarchyChanged();
-  }
-
  private:
   RenderWidgetHostViewAura* view_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowObserver);
 };
 
-// This class provides functionality to observe the ancestors of the RWHVA for
-// bounds changes. This is done to snap the RWHVA window to a pixel boundary,
-// which could change when the bounds relative to the root changes.
-// An example where this happens is below:-
-// The fast resize code path for bookmarks where in the parent of RWHVA which
-// is WCV has its bounds changed before the bookmark is hidden. This results in
-// the traditional bounds change notification for the WCV reporting the old
-// bounds as the bookmark is still around. Observing all the ancestors of the
-// RWHVA window enables us to know when the bounds of the window relative to
-// root changes and allows us to snap accordingly.
-class RenderWidgetHostViewAura::WindowAncestorObserver
-    : public aura::WindowObserver {
- public:
-  explicit WindowAncestorObserver(RenderWidgetHostViewAura* view)
-      : view_(view) {
-    aura::Window* parent = view_->window_->parent();
-    while (parent) {
-      parent->AddObserver(this);
-      ancestors_.insert(parent);
-      parent = parent->parent();
-    }
-  }
-
-  ~WindowAncestorObserver() override {
-    RemoveAncestorObservers();
-  }
-
-  void OnWindowBoundsChanged(aura::Window* window,
-                             const gfx::Rect& old_bounds,
-                             const gfx::Rect& new_bounds) override {
-    DCHECK(ancestors_.find(window) != ancestors_.end());
-    if (new_bounds.origin() != old_bounds.origin())
-      view_->HandleParentBoundsChanged();
-  }
-
- private:
-  void RemoveAncestorObservers() {
-    for (auto ancestor : ancestors_)
-      ancestor->RemoveObserver(this);
-    ancestors_.clear();
-  }
-
-  RenderWidgetHostViewAura* view_;
-  std::set<aura::Window*> ancestors_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowAncestorObserver);
-};
-
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, public:
 
 RenderWidgetHostViewAura::RenderWidgetHostViewAura(RenderWidgetHost* host,
                                                    bool is_guest_view_hack)
     : host_(RenderWidgetHostImpl::From(host)),
       window_(new aura::Window(this)),
       delegated_frame_host_(new DelegatedFrameHost(this)),
       in_shutdown_(false),
       in_bounds_changed_(false),
@@ skipping 17 matching lines @@
       showing_context_menu_(false),
 #endif
       has_snapped_to_boundary_(false),
       touch_editing_client_(NULL),
       is_guest_view_hack_(is_guest_view_hack),
       weak_ptr_factory_(this) {
   if (!is_guest_view_hack_)
     host_->SetView(this);
 
   window_observer_.reset(new WindowObserver(this));
-
   aura::client::SetTooltipText(window_, &tooltip_);
   aura::client::SetActivationDelegate(window_, this);
   aura::client::SetFocusChangeObserver(window_, this);
   window_->set_layer_owner_delegate(delegated_frame_host_.get());
   gfx::Screen::GetScreenFor(window_)->AddObserver(this);
 
   bool overscroll_enabled = base::CommandLine::ForCurrentProcess()->
       GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
   SetOverscrollControllerEnabled(overscroll_enabled);
 }
@@ skipping 319 matching lines @@
                                   ui::EF_RIGHT_MOUSE_BUTTON;
       return (event->flags() & kAllowedButtons) != 0;
     }
     default:
       break;
   }
 #endif
   return true;
 }
 
-void RenderWidgetHostViewAura::HandleParentBoundsChanged() {
-  SnapToPhysicalPixelBoundary();
-#if defined(OS_WIN)
-  if (legacy_render_widget_host_HWND_) {
-    legacy_render_widget_host_HWND_->SetBounds(
-        window_->GetBoundsInRootWindow());
-  }
-#endif
-}
-
-void RenderWidgetHostViewAura::ParentHierarchyChanged() {
-  ancestor_window_observer_.reset(new WindowAncestorObserver(this));
-  // Snap when we receive a hierarchy changed. http://crbug.com/388908.
-  HandleParentBoundsChanged();
-}
-
 void RenderWidgetHostViewAura::MovePluginWindows(
     const std::vector<WebPluginGeometry>& plugin_window_moves) {
 #if defined(OS_WIN)
   // We need to clip the rectangle to the tab's viewport, otherwise we will draw
   // over the browser UI.
   if (!window_->GetRootWindow()) {
     DCHECK(plugin_window_moves.empty());
     return;
   }
   HWND parent = window_->GetHost()->GetAcceleratedWidget();
@@ skipping 1946 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content