chrome/browser/android/voice_search_tab_helper.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/voice_search_tab_helper.h"

#include "base/command_line.h"
#include "components/google/core/browser/google_util.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/web_preferences.h"
#include "media/base/media_switches.h"

DEFINE_WEB_CONTENTS_USER_DATA_KEY(VoiceSearchTabHelper);

// TODO(715588): this class shouldn't be playing with the user gesture
// requirements like this.
VoiceSearchTabHelper::VoiceSearchTabHelper(content::WebContents* contents)
    : content::WebContentsObserver(contents) {
  const base::CommandLine* command_line =
      base::CommandLine::ForCurrentProcess();
  gesture_requirement_for_playback_disabled_ =
      media::GetEffectiveAutoplayPolicy(*command_line) ==
      switches::autoplay::kNoUserGestureRequiredPolicy;
}

VoiceSearchTabHelper::~VoiceSearchTabHelper() {
}

void VoiceSearchTabHelper::NavigationEntryCommitted(
    const content::LoadCommittedDetails& load_details) {
  // In the case where media autoplay has been disabled by default (e.g. in
  // performance media tests) do not update it based on navigation changes.
  if (gesture_requirement_for_playback_disabled_)
    return;

  content::RenderViewHost* host = web_contents()->GetRenderViewHost();
  content::WebPreferences prefs = host->GetWebkitPreferences();

  bool gesture_required =
      !google_util::IsGoogleSearchUrl(web_contents()->GetLastCommittedURL());
  bool gesture_required_by_prefs =
      prefs.autoplay_policy == content::AutoplayPolicy::kUserGestureRequired;

  if (gesture_required != gesture_required_by_prefs) {
    // TODO(chrishtr): this is wrong. user_gesture_required_for_media_playback
    // will be reset the next time a preference changes.
    // TODO(mlamouri): this is even more wrong because it makes assumptions with
    // regards to the default autoplay policy.
    prefs.autoplay_policy =
        gesture_required
            ? content::AutoplayPolicy::kDocumentUserActivationRequired
            : content::AutoplayPolicy::kNoUserGestureRequired;
    host->UpdateWebkitPreferences(prefs);
  }
}