Implement overscroll support for the virtual keyboard.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index ad374246f96ac5d750fb9703868bb584f8262ff5..f324aa83ab5420b553b525812068603c12493901 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -875,6 +875,21 @@ void RenderWidgetHostViewAura::SetBackground(const SkBitmap& background) {
   window_->layer()->SetFillsBoundsOpaquely(background.isOpaque());
 }
 
+gfx::Size RenderWidgetHostViewAura::GetVisibleViewportSize() const {
+  gfx::Rect window_bounds = window_->GetBoundsInScreen();

[sky, 2014/04/24 19:15:01]

GetBoundsInScreen()->bounds()

[kevers, 2014/04/24 20:09:00]

Done.

+  int viewport_width = window_bounds.width() - insets_.left() - insets_.right();

[sky, 2014/04/24 19:15:01]

std::max(0, ...) for both of these lines?

[kevers, 2014/04/24 20:09:00]

Done.

+  int viewport_height = window_bounds.height() - insets_.top() -
+     insets_.bottom();
+  return gfx::Size(viewport_width, viewport_height);
+}
+
+void RenderWidgetHostViewAura::SetInsets(const gfx::Insets& insets) {
+  if (insets != insets_) {
+    insets_ = insets;
+    host_->WasResized();
+  }
+}
+
 void RenderWidgetHostViewAura::UpdateCursor(const WebCursor& cursor) {
   current_cursor_ = cursor;
   const gfx::Display display = gfx::Screen::GetScreenFor(window_)->