Skip installation process if WebAPK is already installed.

chrome/browser/android/shortcut_helper.cc

 // Copyright 2013 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 "chrome/browser/android/shortcut_helper.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
@@ skipping 226 matching lines @@
         env, java_url, SkColorGetR(mean_color), SkColorGetG(mean_color),
         SkColorGetB(mean_color));
   }
 
   return result.obj()
              ? gfx::CreateSkBitmapFromJavaBitmap(gfx::JavaBitmap(result.obj()))
              : SkBitmap();
 }
 
 // static
+std::string ShortcutHelper::QueryWebApkPackage(const GURL& url) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> java_url =
+      base::android::ConvertUTF8ToJavaString(env, url.spec());
+  ScopedJavaLocalRef<jstring> java_webapk_package_name =
+      Java_ShortcutHelper_queryWebApkPackage(env, java_url);
+
+  std::string webapk_package_name = "";
+  if (java_webapk_package_name.obj()) {
+    webapk_package_name = base::android::ConvertJavaStringToUTF8(
+        env, java_webapk_package_name);
+  }
+  return webapk_package_name;
+}
+
+// static
 bool ShortcutHelper::IsWebApkInstalled(const GURL& url) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> java_url =
       base::android::ConvertUTF8ToJavaString(env, url.spec());
   return Java_ShortcutHelper_isWebApkInstalled(env, java_url);
 }
 
 GURL ShortcutHelper::GetScopeFromURL(const GURL& url) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> java_url =
@@ skipping 16 matching lines @@
   DCHECK(jsplash_image_callback);
   base::Closure* splash_image_callback =
       reinterpret_cast<base::Closure*>(jsplash_image_callback);
   splash_image_callback->Run();
   delete splash_image_callback;
 }
 
 bool ShortcutHelper::RegisterShortcutHelper(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }