Start renderer in ContentViewCoreImpl::EvaluateJavaScript.

content/browser/android/content_view_core_impl.cc

 // Copyright 2012 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.
 
 #include "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 1454 matching lines @@
   ScopedJavaLocalRef<jstring> j_json = ConvertUTF8ToJavaString(env, json);
   Java_ContentViewCore_onEvaluateJavaScriptResult(env,
                                                   j_json.obj(),
                                                   callback.obj());
 }
 }  // namespace
 
 void ContentViewCoreImpl::EvaluateJavaScript(JNIEnv* env,
                                              jobject obj,
                                              jstring script,
-                                             jobject callback) {
-  RenderViewHost* host = web_contents_->GetRenderViewHost();
-  DCHECK(host);
+                                             jobject callback,
+                                             jboolean start_renderer) {
+  RenderViewHost* rvh =
+      static_cast<RenderViewHost*>(web_contents_->GetRenderViewHost());
+  DCHECK(rvh);
+
+  if (start_renderer && !rvh->IsRenderViewLive()) {
+    if (!web_contents_->CreateRenderViewWithoutNavigationEntry(rvh)) {

[Charlie Reis, 2013/08/20 22:03:49]

Maybe navigate it to about:blank first instead?

[michaelbai, 2013/08/21 23:32:17]

Already tried, the Java context can not be transfer to the next page.

On 2013/08/20 22:03:49, creis wrote:

+      LOG(ERROR) << "Falied to create RenderView in EvaluateJavaScript";

[Charlie Reis, 2013/08/20 22:03:49]

nit: Failed

[michaelbai, 2013/08/21 23:32:17]

Done.

+      return;
+    }
+  }
 
   if (!callback) {
     // No callback requested.
-    host->ExecuteJavascriptInWebFrame(string16(),  // frame_xpath
-                                      ConvertJavaStringToUTF16(env, script));
+    rvh->ExecuteJavascriptInWebFrame(string16(),  // frame_xpath
+                                     ConvertJavaStringToUTF16(env, script));
     return;
   }
 
   // Secure the Java callback in a scoped object and give ownership of it to the
   // base::Callback.
   ScopedJavaGlobalRef<jobject> j_callback;
   j_callback.Reset(env, callback);
   content::RenderViewHost::JavascriptResultCallback c_callback =
       base::Bind(&JavaScriptResultCallback, j_callback);
 
-  host->ExecuteJavascriptInWebFrameCallbackResult(
+  rvh->ExecuteJavascriptInWebFrameCallbackResult(
       string16(),  // frame_xpath
       ConvertJavaStringToUTF16(env, script),
       c_callback);
 }
 
 bool ContentViewCoreImpl::GetUseDesktopUserAgent(
     JNIEnv* env, jobject obj) {
   NavigationEntry* entry = web_contents_->GetController().GetActiveEntry();
   return entry && entry->GetIsOverridingUserAgent();
 }
@@ skipping 90 matching lines @@
       reinterpret_cast<ui::ViewAndroid*>(view_android),
       reinterpret_cast<ui::WindowAndroid*>(window_android));
   return reinterpret_cast<jint>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content