Skip installation process if WebAPK is already installed.

chrome/browser/android/shortcut_helper.h

Index: chrome/browser/android/shortcut_helper.h
diff --git a/chrome/browser/android/shortcut_helper.h b/chrome/browser/android/shortcut_helper.h
index 86c171fae5430c651708bdb678a8e09eadb9264a..855bf7ed5715b4cfb19f2226edf08b79fb7f0491 100644
--- a/chrome/browser/android/shortcut_helper.h
+++ b/chrome/browser/android/shortcut_helper.h
@@ -96,7 +96,11 @@ class ShortcutHelper {
                                                    const GURL& url,
                                                    bool* is_generated);
 
-  // Returns true if WebAPKs are enabled and there is a WebAPK installed which
+  // Returns the package name of the WebAPK if WebAPKS are enabled and there is

[pkotwicz, 2016/09/29 14:18:54]

Nit: WebAPKS -> WebAPKs

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

Done.

+  // an installed WebAPK which can handle |url|. Returns empty string otherwise.
+  static std::string QueryWebApkPackage(const GURL& url);
+
+  // Returns true if WebAPKs are enabled and there is an installed WebAPK which
   // can handle |url|.
   static bool IsWebApkInstalled(const GURL& url);