Add Java wrapper for RenderFrameHost

content/browser/web_contents/web_contents_android.cc

Index: content/browser/web_contents/web_contents_android.cc
diff --git a/content/browser/web_contents/web_contents_android.cc b/content/browser/web_contents/web_contents_android.cc
index c373a2060f6f4e442b9338f7d189acc35f3e9c48..bdfaca542d1e444aff14bf210007eccd3cabdbd2 100644
--- a/content/browser/web_contents/web_contents_android.cc
+++ b/content/browser/web_contents/web_contents_android.cc
@@ -232,6 +232,23 @@ static void DestroyWebContents(JNIEnv* env,
 }
 
 // static
+ScopedJavaLocalRef<jobject> FromRenderFrameHost(

[boliu, 2017/02/16 01:00:58]

this is a really convoluted way to implement this..

maybe we should have a RenderFrameHostDelegate (which I guess at this point is
empty) in java, then it has to be passed to RFH constructor, and java
WebContents can just cast it back

[rwlbuis, 2017/03/01 21:53:57]

Ok I added RenderFrameHostDelegate.

+    JNIEnv* env,
+    const JavaParamRef<jclass>& clazz,
+    const JavaParamRef<jobject>& jrender_frame_host_android) {
+  RenderFrameHost* rfh =
+      RenderFrameHost::FromJavaRenderFrameHost(jrender_frame_host_android);
+  if (!rfh)
+    return ScopedJavaLocalRef<jobject>();
+
+  WebContents* webContents = WebContents::FromRenderFrameHost(rfh);
+  if (!webContents)
+    return ScopedJavaLocalRef<jobject>();
+
+  return webContents->GetJavaWebContents();
+}
+
+// static
 ScopedJavaLocalRef<jobject> FromNativePtr(JNIEnv* env,
                                           const JavaParamRef<jclass>& clazz,
                                           jlong web_contents_ptr) {
@@ -285,6 +302,12 @@ WebContentsAndroid::GetJavaObject() {
   return base::android::ScopedJavaLocalRef<jobject>(obj_);
 }
 
+ScopedJavaLocalRef<jobject> WebContentsAndroid::GetMainFrame(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) const {
+  return web_contents_->GetMainFrame()->GetJavaRenderFrameHost();
+}
+
 ScopedJavaLocalRef<jstring> WebContentsAndroid::GetTitle(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) const {