[App banners] Add server-controlled experiment to disable app banners

chrome/browser/android/banners/app_banner_manager.cc

 // Copyright 2014 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/banners/app_banner_manager.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/android/banners/app_banner_infobar_delegate.h"
 #include "chrome/browser/android/manifest_icon_selector.h"
 #include "chrome/browser/android/shortcut_helper.h"
 #include "chrome/browser/android/shortcut_info.h"
 #include "chrome/browser/banners/app_banner_metrics.h"
 #include "chrome/browser/banners/app_banner_settings_helper.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/metrics/rappor/sampling.h"
@@ skipping 124 matching lines @@
 }
 
 void AppBannerManager::OnDidGetManifest(const content::Manifest& manifest) {
   if (web_contents()->IsBeingDestroyed())
     return;
 
   if (manifest.IsEmpty()
       || !manifest.start_url.is_valid()
       || (manifest.name.is_null() && manifest.short_name.is_null())) {
     // No usable manifest, see if there is a play store meta tag.
+    if (!IsEnabledForNativeApps())
+      return;
+
     Send(new ChromeViewMsg_RetrieveMetaTagContent(routing_id(),
                                                   validated_url_,
                                                   kBannerTag));
     return;
   }
 
   banners::TrackDisplayEvent(DISPLAY_EVENT_BANNER_REQUESTED);
 
   web_app_data_ = manifest;
   app_title_ = web_app_data_.name.string();
@@ skipping 189 matching lines @@
   fetcher_->Start(
       profile->GetRequestContext(),
       std::string(),
       net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
       net::LOAD_NORMAL);
   app_icon_url_ = image_url;
   return true;
 }
 
 // static
+bool AppBannerManager::IsEnabledForNativeApps() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableAppInstallAlerts);
+}
+
+// static
 base::Time AppBannerManager::GetCurrentTime() {
   return base::Time::Now() + gTimeDeltaForTesting;
 }
 
 jlong Init(JNIEnv* env, jobject obj, jint icon_size) {
   AppBannerManager* manager = new AppBannerManager(env, obj, icon_size);
   return reinterpret_cast<intptr_t>(manager);
 }
 
 jboolean IsEnabled(JNIEnv* env, jclass clazz) {
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableAppInstallAlerts);
+  const std::string group_name =
+      base::FieldTrialList::FindFullName("AppBanners");
+  return group_name == "Enabled";
 }
 
 void SetTimeDeltaForTesting(JNIEnv* env, jclass clazz, jint days) {
   gTimeDeltaForTesting = base::TimeDelta::FromDays(days);
 }
 
 void DisableSecureSchemeCheckForTesting(JNIEnv* env, jclass clazz) {
   gDisableSecureCheckForTesting = true;
 }
 
 // Register native methods
 bool RegisterAppBannerManager(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace banners