[blink] Use early returns in baseBackgroundColor(Override) setters.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 3563 matching lines @@
 
 void WebViewImpl::setBaseBackgroundColor(WebColor color) {
   if (m_baseBackgroundColor == color)
     return;
 
   m_baseBackgroundColor = color;
   updateBaseBackgroundColor();
 }
 
 void WebViewImpl::setBaseBackgroundColorOverride(WebColor color) {
+  if (m_baseBackgroundColorOverrideEnabled &&
+      m_baseBackgroundColorOverride == color) {
+    return;
+  }
+
   m_baseBackgroundColorOverrideEnabled = true;
   m_baseBackgroundColorOverride = color;
   if (mainFrameImpl()) {
     // Force lifecycle update to ensure we're good to call
     // FrameView::setBaseBackgroundColor().
     mainFrameImpl()
         ->frame()
         ->view()
         ->updateLifecycleToCompositingCleanPlusScrolling();
   }
   updateBaseBackgroundColor();
 }
 
 void WebViewImpl::clearBaseBackgroundColorOverride() {
+  if (!m_baseBackgroundColorOverrideEnabled)
+    return;
+
   m_baseBackgroundColorOverrideEnabled = false;
   if (mainFrameImpl()) {
     // Force lifecycle update to ensure we're good to call
     // FrameView::setBaseBackgroundColor().
     mainFrameImpl()
         ->frame()
         ->view()
         ->updateLifecycleToCompositingCleanPlusScrolling();
   }
   updateBaseBackgroundColor();
@@ skipping 570 matching lines @@
   if (focusedFrame->localFrameRoot() != mainFrameImpl()->frame())
     return nullptr;
   return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const {
   return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink