Add rendering support to the TestShell.

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 1b9345a82a6140472c37d9694a3b5281c0df8573..eaebc5563e555af3f5dde8f5d54ea7b474a81c5d 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -3,6 +3,27 @@
 // found in the LICENSE file.
 
 #include "chrome/browser/android/tab_android.h"
+#include "chrome/browser/ui/tab_contents/tab_contents.h"
+#include "content/public/browser/android/content_view_core.h"
+#include "content/public/browser/web_contents.h"
+
+using content::ContentViewCore;
+using content::WebContents;
+
+TabContents* TabAndroid::GetOrCreateTabContents(WebContents* web_contents) {
+  TabContents* tab_contents = TabContents::FromWebContents(web_contents);
+  return tab_contents ? tab_contents : TabContents::Factory::CreateTabContents(
+      web_contents);
+}
+
+TabContents* TabAndroid::InitTabContentsFromView(JNIEnv* env,
+                                                 jobject content_view) {
+  ContentViewCore* content_view_core =
+      ContentViewCore::GetNativeContentViewCore(env, content_view);
+  DCHECK(content_view_core);
+  DCHECK(content_view_core->GetWebContents());
+  return GetOrCreateTabContents(content_view_core->GetWebContents());
+}
 
 TabAndroid::TabAndroid() : tab_id_(-1) {
 }