Mac fullscreen low power video: Add FullscreenLowPowerControllerCocoa

chrome/browser/ui/cocoa/fullscreen_low_power_coordinator.h

Index: chrome/browser/ui/cocoa/fullscreen_low_power_coordinator.h
diff --git a/chrome/browser/ui/cocoa/fullscreen_low_power_coordinator.h b/chrome/browser/ui/cocoa/fullscreen_low_power_coordinator.h
new file mode 100644
index 0000000000000000000000000000000000000000..406b5f73ee549ab1f7e608450711be01e0437c60
--- /dev/null
+++ b/chrome/browser/ui/cocoa/fullscreen_low_power_coordinator.h
@@ -0,0 +1,66 @@
+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_UI_COCOA_FULLSCREEN_LOW_POWER_COORDINATOR_H_
+#define CHROME_BROWSER_UI_COCOA_FULLSCREEN_LOW_POWER_COORDINATOR_H_
+
+#include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
+#include "ui/accelerated_widget_mac/fullscreen_low_power_coordinator.h"
+
+@class FullscreenLowPowerWindow;
+
+// This class coordinates switching to and from the fullscreen low power
+// NSWindow. This is created by the BrowserWindowController when entering
+// fullscreen mode. If it is ``safe'' to use the fullscreen low power window,
+// this will move that NSWindow in front of the browser NSWindow.
+//
+// Whether or not it is ``safe'' to use the fullscreen low power window depends
+// on two sources of input: The AcceleratedWidgetMac, which tells this whether
+// or not the current web content can be displayed in fullscreen low power mode,
+// and the BrowserWindowController, which tells this whether or not there is any
+// UI that the fullscreen low power window would cover.
+class FullscreenLowPowerCoordinatorCocoa
+    : public ui::FullscreenLowPowerCoordinator {
+ public:
+  FullscreenLowPowerCoordinatorCocoa(NSWindow* content_window,
+                                     ui::AcceleratedWidgetMac* widget);
+  ~FullscreenLowPowerCoordinatorCocoa();
+
+  // Interface to BrowserWindowController.
+  NSWindow* GetFullscreenLowPowerWindow();
+  void AddLowPowerModeSuppression();
+  void RemoveLowPowerModeSuppression();
+
+  // ui::FullscreenLowPowerCoordinator implementation.
+  void SetLowPowerLayerValid(bool valid) override;
+  void WillLoseAcceleratedWidget() override;
+
+ private:
+  // Determine if we should be fullscreen low power mode, and enter or exit
+  // the mode as needed.
+  void EnterOrExitLowPowerModeIfNeeded();
+
+  // The main fullscreen window.
+  base::scoped_nsobject<NSWindow> content_window_ = nil;
+
+  // Weak, reset by WillLoseAcceleratedWidget before it goes away.
+  ui::AcceleratedWidgetMac* widget_ = nullptr;
+
+  // The window that we will put in front of the main fullscreen window when we
+  // can.
+  base::scoped_nsobject<FullscreenLowPowerWindow> low_power_window_;
+
+  // Set by the AcceleratedWidgetHost with each frame. This must be true to
+  // enter low power mode.
+  bool low_power_layer_valid_ = false;
+
+  // The balance of calls to Add/RemoveLowPowerModeSuppression. This must be
+  // zero to enter low power mode.
+  int suppression_count_ = 0;
+
+  // Updated by EnterOrExitLowPowerModeIfNeeded.
+  bool in_low_power_mode_ = false;
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_FULLSCREEN_LOW_POWER_COORDINATOR_H_