ash: Resize PowerButtonController background layer.

PowerButtonController wasn't getting registered as an
observer on the aura::RootWindow, so its background layer
wasn't resized to match the root window's size.  I don't
think that this caused any problems in practice, as the
layer gets recreated every time it's shown.

BUG=none
TEST=added


Review URL: http://codereview.chromium.org/10263015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134722 0039d316-1c4b-4281-b951-d872f2087c98

ash/shell.cc

@@ -574,14 +574,15 @@ Shell::~Shell() {
   // Alphabetical.
   activation_controller_.reset();
   drag_drop_controller_.reset();
+  event_client_.reset();
   magnification_controller_.reset();
+  monitor_controller_.reset();
+  power_button_controller_.reset();
   resize_shadow_controller_.reset();
   screen_dimmer_.reset();
   shadow_controller_.reset();
-  window_cycle_controller_.reset();
-  event_client_.reset();
-  monitor_controller_.reset();
   tooltip_controller_.reset();
+  window_cycle_controller_.reset();
 
   // Launcher widget has a InputMethodBridge that references to
   // input_method_filter_'s input_method_. So explicitly release launcher_

ash/wm/power_button_controller.cc

@@ -275,6 +275,11 @@ bool PowerButtonController::TestApi::BackgroundLayerIsVisible() const {
          controller_->background_layer_->visible();
 }
 
+gfx::Rect PowerButtonController::TestApi::GetBackgroundLayerBounds() const {
+  ui::Layer* layer = controller_->background_layer_.get();
+  return layer ? layer->bounds() : gfx::Rect();
+}
+
 PowerButtonController::PowerButtonController()
     : login_status_(user::LOGGED_IN_NONE),
       unlocked_login_status_(user::LOGGED_IN_NONE),
@@ -284,9 +289,11 @@ PowerButtonController::PowerButtonController()
       has_legacy_power_button_(
           CommandLine::ForCurrentProcess()->HasSwitch(
               switches::kAuraLegacyPowerButton)) {
+  Shell::GetInstance()->GetRootWindow()->AddRootWindowObserver(this);
 }
 
 PowerButtonController::~PowerButtonController() {
+  Shell::GetInstance()->GetRootWindow()->RemoveRootWindowObserver(this);
 }
 
 void PowerButtonController::OnLoginStateChanged(user::LoginStatus status) {

ash/wm/power_button_controller.h

@@ -15,6 +15,7 @@
 #include "ui/aura/root_window_observer.h"
 
 namespace gfx {
+class Rect;
 class Size;
 }
 
@@ -120,6 +121,10 @@ class ASH_EXPORT PowerButtonController : public aura::RootWindowObserver,
     // Returns true if |background_layer_| is non-NULL and visible.
     bool BackgroundLayerIsVisible() const;
 
+    // Returns |background_layer_|'s bounds, or an empty rect if the layer is
+    // NULL.
+    gfx::Rect GetBackgroundLayerBounds() const;
+
    private:
     PowerButtonController* controller_;  // not owned
 

ash/wm/power_button_controller_unittest.cc

@@ -9,6 +9,8 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "ui/aura/root_window.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
 
 namespace ash {
 namespace test {
@@ -525,5 +527,17 @@ TEST_F(PowerButtonControllerTest, RequestShutdownFromLockScreen) {
   EXPECT_EQ(1, delegate_->num_shutdown_requests());
 }
 
+// Test that the background layer is resized in response to root window resizes.
+TEST_F(PowerButtonControllerTest, ResizeBackgroundLayer) {
+  controller_->OnPowerButtonEvent(true, base::TimeTicks::Now());
+  EXPECT_EQ(Shell::GetRootWindow()->bounds().ToString(),
+            test_api_->GetBackgroundLayerBounds().ToString());
+
+  const gfx::Size kNewSize(400, 300);
+  Shell::GetRootWindow()->SetHostSize(kNewSize);
+  EXPECT_EQ(gfx::Rect(kNewSize).ToString(),
+            test_api_->GetBackgroundLayerBounds().ToString());
+}
+
 }  // namespace test
 }  // namespace ash