Skip installation process if WebAPK is already installed.

chrome/browser/android/banners/app_banner_infobar_delegate_android.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_INFOBAR_DELEGATE_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_INFOBAR_DELEGATE_ANDROID_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 53 matching lines @@
   // returned to Chrome.
   void OnInstallIntentReturned(JNIEnv* env,
                                const base::android::JavaParamRef<jobject>& obj,
                                jboolean jis_installing);
 
   // Called when the InstallerDelegate task has finished.
   void OnInstallFinished(JNIEnv* env,
                          const base::android::JavaParamRef<jobject>& obj,
                          jboolean success);
 
+  // TODO(zpeng): Move function from public to private.

[dominickn, 2016/09/28 02:10:26]

Remove this comment, since this method was moved to private in
https://codereview.chromium.org/2375503003

[F, 2016/09/30 18:02:02]

Done.

   // When user accepts to install a WebAPK, this function sends a request
   // to the WebAPK Server to create a WebAPK and install it. It returns
   // false to prevent infobar from disappearing when installation starts.
   // When user clicks the Open button after the intallation is compelete, this
   // function launches the installed WebAPK and returns true.
   bool AcceptWebApk(content::WebContents* web_contents);
 
  private:
   // The states of a WebAPK installation, where the infobar is displayed during
   // the entire installation process. This state is used to correctly record
@@ skipping 66 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerInfoBarDelegateAndroid);
 };
 
 // Register native methods.
 bool RegisterAppBannerInfoBarDelegateAndroid(JNIEnv* env);
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_INFOBAR_DELEGATE_ANDROID_H_