[DevTools] Implement screen orientation override.

Source/modules/screen_orientation/ScreenOrientationController.h

Index: Source/modules/screen_orientation/ScreenOrientationController.h
diff --git a/Source/modules/screen_orientation/ScreenOrientationController.h b/Source/modules/screen_orientation/ScreenOrientationController.h
index f77d1bc21695efb6b65f5f68bd546cfe8753a084..6b886427ef9e2e840a46cffc8319980d4c76dfcc 100644
--- a/Source/modules/screen_orientation/ScreenOrientationController.h
+++ b/Source/modules/screen_orientation/ScreenOrientationController.h
@@ -36,6 +36,9 @@ public:
     void lock(WebScreenOrientationLockType, WebLockOrientationCallback*);
     void unlock();
 
+    void setOverride(WebScreenOrientationType, unsigned short angle);
+    void clearOverride();
+
     static void provideTo(LocalFrame&, WebScreenOrientationClient*);
     static ScreenOrientationController* from(LocalFrame&);
     static const char* supplementName();
@@ -45,7 +48,7 @@ public:
 private:
     ScreenOrientationController(LocalFrame&, WebScreenOrientationClient*);
 
-    static WebScreenOrientationType computeOrientation(ChromeClient&);
+    static WebScreenOrientationType computeOrientation(const IntRect&, uint16_t);
 
     // Inherited from PlatformEventController.
     virtual void didUpdateData() override;
@@ -57,6 +60,9 @@ private:
     // Inherited from LocalFrameLifecycleObserver.
     virtual void willDetachFrameHost() override;
 
+    unsigned short effectiveAngle(ChromeClient&);
+    WebScreenOrientationType effectiveType(ChromeClient&);
+
     void notifyDispatcher();
 
     void updateOrientation();
@@ -68,6 +74,9 @@ private:
     PersistentWillBeMember<ScreenOrientation> m_orientation;
     WebScreenOrientationClient* m_client;
     Timer<ScreenOrientationController> m_dispatchEventTimer;
+    bool m_override;
+    WebScreenOrientationType m_overrideType;
+    unsigned short m_overrideAngle;
 };
 
 } // namespace blink