Notification for device scale factor change

BUG=105165
TEST=updated compositor test to cover OnDeviceScaleFactorChagned.

Review URL: https://chromiumcodereview.appspot.com/10391165

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137571 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 10 insertions, 0 deletions

diff --git a/ui/views/view.cc b/ui/views/view.cc
index f5dd39b..cbcb45c 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -1230,6 +1230,10 @@ void View::OnPaintLayer(gfx::Canvas* canvas) {
   PaintCommon(canvas);
 }
 
+void View::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  // Repainting with new scale factor will paint the content at the right scale.
+}
+
 void View::ReorderLayers() {
   View* v = this;
   while (v && !v->layer())
diff --git a/ui/views/view.h b/ui/views/view.h
index fc4a27f..8492d95 100644
--- a/ui/views/view.h
+++ b/ui/views/view.h
@@ -996,6 +996,7 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
 
   // Overridden from ui::LayerDelegate:
   virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
 
   // Finds the layer that this view paints to (it may belong to an ancestor
   // view), then reorders the immediate children of that layer to match the
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index b63e8fd..a71b3d7 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -784,6 +784,10 @@ void NativeWidgetAura::OnPaint(gfx::Canvas* canvas) {
   delegate_->OnNativeWidgetPaint(canvas);
 }
 
+void NativeWidgetAura::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  // Repainting with new scale factor will paint the content at the right scale.
+}
+
 void NativeWidgetAura::OnWindowDestroying() {
   delegate_->OnNativeWidgetDestroying();
 
diff --git a/ui/views/widget/native_widget_aura.h b/ui/views/widget/native_widget_aura.h
index c9a1480..7d89a77 100644
--- a/ui/views/widget/native_widget_aura.h
+++ b/ui/views/widget/native_widget_aura.h
@@ -144,6 +144,7 @@ class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
   virtual bool CanFocus() OVERRIDE;
   virtual void OnCaptureLost() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void OnWindowDestroying() OVERRIDE;
   virtual void OnWindowDestroyed() OVERRIDE;
   virtual void OnWindowVisibilityChanged(bool visible) OVERRIDE;