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

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

Index: third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
index fa53cf4be94d6f5fdaa592e667ebd34d4fd8f577..e7828ea4f2178a69633fc93e318876e286e63456 100644
--- a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
+++ b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
@@ -302,13 +302,27 @@ void WebFrameWidgetImpl::clearBackgroundColorOverride() {
 }
 
 void WebFrameWidgetImpl::setBaseBackgroundColorOverride(WebColor color) {
+  if (m_baseBackgroundColorOverrideEnabled &&
+      m_baseBackgroundColorOverride == color) {
+    return;
+  }
+
   m_baseBackgroundColorOverrideEnabled = true;
   m_baseBackgroundColorOverride = color;
+  // Force lifecycle update to ensure we're good to call
+  // FrameView::setBaseBackgroundColor().
+  m_localRoot->frameView()->updateLifecycleToCompositingCleanPlusScrolling();
   updateBaseBackgroundColor();
 }
 
 void WebFrameWidgetImpl::clearBaseBackgroundColorOverride() {
+  if (!m_baseBackgroundColorOverrideEnabled)
+    return;
+
   m_baseBackgroundColorOverrideEnabled = false;
+  // Force lifecycle update to ensure we're good to call
+  // FrameView::setBaseBackgroundColor().
+  m_localRoot->frameView()->updateLifecycleToCompositingCleanPlusScrolling();
   updateBaseBackgroundColor();
 }