Append playinline=chrome_inline to the store referrer on native app banner install.

chrome/browser/android/banners/app_banner_manager_android.cc

Index: chrome/browser/android/banners/app_banner_manager_android.cc
diff --git a/chrome/browser/android/banners/app_banner_manager_android.cc b/chrome/browser/android/banners/app_banner_manager_android.cc
index 953c0e934e4eca9adaf4821cb644dc182130c3fd..80e5e6cc99f4b4c6f0b8e5b4066f03adb17cb3a5 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.cc
+++ b/chrome/browser/android/banners/app_banner_manager_android.cc
@@ -25,6 +25,7 @@ namespace {
 const char kPlayPlatform[] = "play";
 const char kReferrerName[] = "referrer";
 const char kIdName[] = "id";
+const char kPlayInlineReferrer[] = "playinline=chrome_inline";
 
 }  // anonymous namespace
 
@@ -73,7 +74,15 @@ bool AppBannerManagerAndroid::HandleNonWebApp(const std::string& platform,
     return false;
   }
 
-  std::string referrer = ExtractQueryValueForName(url, kReferrerName);
+  std::string referrer =
+      ExtractQueryValueForName(url, kReferrerName);
+
+  // Attach the chrome_inline referrer value, prefixed with "&" if the referrer
+  // is non empty.
+  if (referrer.empty())
+    referrer = kPlayInlineReferrer;
+  else
+    referrer.append("&").append(kPlayInlineReferrer);
 
   ScopedJavaLocalRef<jstring> jurl(
       ConvertUTF8ToJavaString(env, data_fetcher()->validated_url().spec()));