Start caching the theme color in web_contents

content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsImpl.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser.webcontents;
 
+import android.graphics.Color;
+
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 import org.chromium.content_public.browser.JavaScriptCallback;
 import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.NavigationTransitionDelegate;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.browser.WebContentsObserver;
 
 /**
  * The WebContentsImpl Java wrapper to allow communicating with the native WebContentsImpl
@@ skipping 297 matching lines @@
         return nativeHasAccessedInitialDocument(mNativeWebContentsAndroid);
     }
 
     @CalledByNative
     private static void onEvaluateJavaScriptResult(
             String jsonResult, JavaScriptCallback callback) {
         callback.handleJavaScriptResult(jsonResult);
     }
 
     @Override
+    public int getThemeColor(int defaultColor) {
+        int color = nativeGetThemeColor(mNativeWebContentsAndroid);
+        if (color == Color.TRANSPARENT) return defaultColor;
+
+        return (color | 0xFF000000);
+    }
+
+    @Override
     public void addObserver(WebContentsObserver observer) {
         assert mNativeWebContentsAndroid != 0;
         if (mObserverProxy == null) mObserverProxy = new WebContentsObserverProxy(this);
         mObserverProxy.addObserver(observer);
     }
 
     @Override
     public void removeObserver(WebContentsObserver observer) {
         if (mObserverProxy == null) return;
         mObserverProxy.removeObserver(observer);
@@ skipping 40 matching lines @@
     private native void nativeShowTransitionElements(long nativeWebContentsAndroid,
             String cssSelector);
     private native void nativeClearNavigationTransitionData(long nativeWebContentsAndroid);
     private native void nativeFetchTransitionElements(long nativeWebContentsAndroid, String url);
     private native void nativeEvaluateJavaScript(long nativeWebContentsAndroid,
             String script, JavaScriptCallback callback);
     private native void nativeAddMessageToDevToolsConsole(
             long nativeWebContentsAndroid, int level, String message);
     private native boolean nativeHasAccessedInitialDocument(
             long nativeWebContentsAndroid);
+    private native int nativeGetThemeColor(long nativeWebContentsAndroid);
 }