Handles users rotating screen too early

ash/display/display_configuration_controller.h

Index: ash/display/display_configuration_controller.h
diff --git a/ash/display/display_configuration_controller.h b/ash/display/display_configuration_controller.h
index 03563a28a6624c93b9b9db3f0fe70452fbee9e02..1128cce851205632b185e521bb35dc0608978557 100644
--- a/ash/display/display_configuration_controller.h
+++ b/ash/display/display_configuration_controller.h
@@ -9,6 +9,7 @@
 
 #include "ash/ash_export.h"
 #include "ash/display/window_tree_host_manager.h"
+#include "ash/rotator/screen_rotation_animator_observer.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/display/display.h"
@@ -21,10 +22,11 @@ class DisplayManager;
 namespace ash {
 
 namespace test {
-class ShellTestApi;
+class DisplayConfigurationControllerTestApi;
 }  // namespace test
 
 class DisplayAnimator;
+class ScreenRotationAnimator;
 
 // This class controls Display related configuration. Specifically it:
 // * Handles animated transitions where appropriate.
@@ -32,7 +34,8 @@ class DisplayAnimator;
 // * Provides a single interface for UI and API classes.
 // * TODO: Forwards display configuration changed events to UI and API classes.
 class ASH_EXPORT DisplayConfigurationController
-    : public WindowTreeHostManager::Observer {
+    : public WindowTreeHostManager::Observer,
+      public ScreenRotationAnimatorObserver {
  public:
   DisplayConfigurationController(
       display::DisplayManager* display_manager,
@@ -59,8 +62,12 @@ class ASH_EXPORT DisplayConfigurationController
   // WindowTreeHostManager::Observer
   void OnDisplayConfigurationChanged() override;
 
+  // ScreenRotationAnimatorObserver
+  void OnEndedOrAbortedScreenRotationAnimation(

[oshima, 2017/03/16 20:13:09]

OnRotationAnimationFinished. then document that it'll be called when ended or
aborted.

[wutao, 2017/03/17 00:01:03]

Changed to OnScreenRotationAnimationFinished

+      ScreenRotationAnimator* animator) override;
+
  protected:
-  friend class ash::test::ShellTestApi;
+  friend class ash::test::DisplayConfigurationControllerTestApi;
 
   // Allow tests to skip animations.
   void ResetAnimatorForTest();
@@ -76,11 +83,35 @@ class ASH_EXPORT DisplayConfigurationController
   void SetMirrorModeImpl(bool mirror);
   void SetPrimaryDisplayIdImpl(int64_t display_id);
 
+  // Returns true if the screen rotation animation can be completed
+  // successfully. For example an animation is not possible if |display_id_|
+  // specifies a display::Display that is not currently active. See
+  // www.crbug.com/479503.
+  bool CanAnimateScreenRotation(int64_t display_id) const;
+
+  // Returns the currently active rotation for the display with |display_id|. If
+  // an animation is in progress, the target rotation will be returned.
+  display::Display::Rotation GetCurrentScreenRotation(int64_t display_id) const;
+
+  // Returns the ScreenRotationAnimator associated with the |display_id|. If
+  // there is no existing ScreenRotationAnimator for |display_id|, it will make
+  // one and store the pair in the |rotation_animator_map_|.
+  ScreenRotationAnimator* GetScreenRotationAnimatorForDisplay(
+      int64_t display_id);
+
   display::DisplayManager* display_manager_;         // weak ptr
   WindowTreeHostManager* window_tree_host_manager_;  // weak ptr
   std::unique_ptr<DisplayAnimator> display_animator_;
   std::unique_ptr<DisplayChangeLimiter> limiter_;
 
+  // Tracks |display_id| to ScreenRotationAnimator mappings. The
+  // |rotation_animator_map_| is populated on demand the first time a
+  // ScreenRotationAnimator is needed for a given |display_id|.
+  // On animation ended or aborted, the animator may be deleted if there is no
+  // more pending rotation request.
+  std::unordered_map<int64_t, std::unique_ptr<ScreenRotationAnimator>>
+      rotation_animator_map_;
+
   base::WeakPtrFactory<DisplayConfigurationController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayConfigurationController);