Add a content API for postMessage

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index cf404ccede7786d7b841e99bbf716a4cc07ae6d7..f70d6d60dd57fb4a27b5d8ed33323c4072be6bc8 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1396,6 +1396,23 @@ public class ContentViewCore
     }
 
     /**
+     * Post a message to a frame.
+     * TODO(sgurun) also add support for transferring a message channel port.
+     *
+     * @param frameName The name of the frame. If the name is null the message is posted
+     *                  to the main frame.
+     * @param message   The message
+     * @param sourceOrigin  The source origin
+     * @param targetOrigin  The target origin
+     */
+    public void postMessageToFrame(String frameName, String message,
+            String sourceOrigin, String targetOrigin) {
+        if (mNativeContentViewCore == 0) return;
+        nativePostMessageToFrame(mNativeContentViewCore, frameName, message, sourceOrigin,
+            targetOrigin);
+    }
+
+    /**
      * To be called when the ContentView is shown.
      */
     public void onShow() {
@@ -3303,6 +3320,9 @@ public class ContentViewCore
     private native void nativeEvaluateJavaScript(long nativeContentViewCoreImpl,
             String script, JavaScriptCallback callback, boolean startRenderer);
 
+    private native void nativePostMessageToFrame(long nativeContentViewCoreImpl, String frameId,
+            String message, String sourceOrigin, String targetOrigin);
+
     private native long nativeGetNativeImeAdapter(long nativeContentViewCoreImpl);
 
     private native int nativeGetCurrentRenderProcessId(long nativeContentViewCoreImpl);