Make code path for bounds changes getting to renderer less brittle

content/browser/web_contents/aura/constrained_windows_observer.cc

Index: content/browser/web_contents/aura/constrained_windows_observer.cc
diff --git a/content/browser/web_contents/aura/constrained_windows_observer.cc b/content/browser/web_contents/aura/constrained_windows_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..aef45451965f5f08be6d7230a94f6d9e3e753b67
--- /dev/null
+++ b/content/browser/web_contents/aura/constrained_windows_observer.cc
@@ -0,0 +1,118 @@
+// Copyright (c) 2013 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/web_contents/aura/constrained_windows_observer.h"
+
+#include "content/browser/renderer_host/render_view_host_factory.h"
+#include "content/browser/renderer_host/render_widget_host_view_aura.h"
+#include "content/browser/renderer_host/render_widget_host_view_aura.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/browser/web_contents/web_contents_view_aura.h"
+#include "content/public/browser/render_widget_host.h"
+#include "ui/aura/window.h"
+
+namespace content {
+namespace {
+
+RenderWidgetHostViewAura* ToRenderWidgetHostViewAura(
+    RenderWidgetHostView* view) {
+  if (!view || RenderViewHostFactory::has_factory())
+    return NULL;  // Can't cast to RenderWidgetHostViewAura in unit tests.
+  RenderProcessHostImpl* process = static_cast<RenderProcessHostImpl*>(
+      view->GetRenderWidgetHost()->GetProcess());
+  if (process->IsGuest())
+    return NULL;
+  return static_cast<RenderWidgetHostViewAura*>(view);
+}
+
+}  // namespace
+
+ConstrainedWindowsObserver::ConstrainedWindowsObserver(
+    WebContentsViewAura* view)
+  : view_(view),
+    parent_(NULL) {
+  view_->window_->AddObserver(this);
+}
+
+ConstrainedWindowsObserver::~ConstrainedWindowsObserver() {
+  if (parent_) {
+    const aura::Window::Windows& children = parent_->children();
+    for (size_t i = 0; i < children.size(); ++i)
+      children[i]->RemoveObserver(this);
+  }
+}
+
+void ConstrainedWindowsObserver::OnWindowAdded(aura::Window* new_window) {
+  if (new_window->parent() != parent_)
+    return;
+
+  new_window->AddObserver(this);
+  UpdateConstrainedWindows(NULL);
+}
+
+void ConstrainedWindowsObserver::OnWillRemoveWindow(aura::Window* window) {
+  if (window->parent() == parent_ && window != view_->window_) {
+    window->RemoveObserver(this);
+    UpdateConstrainedWindows(window);
+  }
+}
+
+void ConstrainedWindowsObserver::OnWindowVisibilityChanged(
+    aura::Window* window,
+    bool visible) {
+  if (window->parent() == parent_ && window != view_->window_)
+    UpdateConstrainedWindows(NULL);
+}
+
+void ConstrainedWindowsObserver::OnWindowParentChanged(aura::Window* window,
+                                                       aura::Window* parent) {
+  if (window != view_->window_)
+    return;
+  if (parent_)
+    parent_->RemoveObserver(this);
+  if (parent_) {
+    const aura::Window::Windows& children = parent_->children();
+    for (size_t i = 0; i < children.size(); ++i)
+      children[i]->RemoveObserver(this);
+
+    RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
+        view_->web_contents_->GetRenderWidgetHostView());
+    if (view)
+      view->UpdateConstrainedWindowRects(std::vector<gfx::Rect>());
+  }
+
+  parent_ = parent;
+  if (parent)
+    parent->AddObserver(this);
+}
+
+void ConstrainedWindowsObserver::OnWindowBoundsChanged(
+    aura::Window* window,
+    const gfx::Rect& old_bounds,
+    const gfx::Rect& new_bounds) {
+  if (window != parent_ || window != view_->window_)
+    UpdateConstrainedWindows(NULL);
+}
+
+void ConstrainedWindowsObserver::UpdateConstrainedWindows(
+    aura::Window* exclude) {
+  RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
+      view_->web_contents_->GetRenderWidgetHostView());
+  if (!view)
+    return;
+
+  std::vector<gfx::Rect> constrained_windows;
+  const aura::Window::Windows& children = parent_->children();
+  for (size_t i = 0; i < children.size(); ++i) {
+    if (children[i] != view_->window_ &&
+        children[i] != exclude &&
+        children[i]->IsVisible()) {
+      constrained_windows.push_back(children[i]->GetBoundsInRootWindow());
+    }
+  }
+
+  //  view->UpdateConstrainedWindowRects(constrained_windows);
+}
+
+}  // namespace content