Add operator== to WebScreenInfo.

public/platform/WebScreenInfo.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 66 matching lines @@
     // It is the opposite of the physical rotation.
     uint16_t orientationAngle;
 
     WebScreenInfo()
         : deviceScaleFactor(1)
         , depth(0)
         , depthPerComponent(0)
         , isMonochrome(false)
         , orientationType(WebScreenOrientationUndefined)
         , orientationAngle(0) { }
+
+    bool operator==(const WebScreenInfo& other) const
+    {
+        return this->deviceScaleFactor == other.deviceScaleFactor
+            && this->depth == other.depth
+            && this->depthPerComponent == other.depthPerComponent
+            && this->isMonochrome == other.isMonochrome
+            && this->rect == other.rect
+            && this->availableRect == other.availableRect
+            && this->orientationType == other.orientationType
+            && this->orientationAngle == other.orientationAngle;
+    }
+
+    bool operator!=(const WebScreenInfo& other) const
+    {
+        return !this->operator==(other);
+    }
 };
 
 } // namespace blink
 
 #endif