Force preload=none and disable autoplay on lowend Android devices.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 14 matching lines @@
 #include "base/metrics/histogram_macros.h"
 #include "base/process/kill.h"
 #include "base/process/process.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/sys_info.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
 #include "content/child/appcache/appcache_dispatcher.h"
 #include "content/child/appcache/web_application_cache_host_impl.h"
 #include "content/child/child_shared_bitmap_manager.h"
 #include "content/child/request_extra_data.h"
 #include "content/child/v8_value_converter_impl.h"
@@ skipping 123 matching lines @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/native_widget_types.h"
 #include "url/url_constants.h"
 #include "v8/include/v8.h"
 
 #if defined(OS_ANDROID)
 #include <cpu-features.h>
 
+#include "base/android/build_info.h"
 #include "content/renderer/android/address_detector.h"
 #include "content/renderer/android/content_detector.h"
 #include "content/renderer/android/disambiguation_popup_helper.h"
 #include "content/renderer/android/email_detector.h"
 #include "content/renderer/android/phone_number_detector.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 #elif defined(OS_MACOSX)
 #include "skia/ext/skia_utils_mac.h"
 #endif
@@ skipping 919 matching lines @@
   settings->setAccessibilityFontScaleFactor(prefs.font_scale_factor);
   settings->setDeviceScaleAdjustment(prefs.device_scale_adjustment);
   settings->setFullscreenSupported(prefs.fullscreen_supported);
   web_view->setIgnoreViewportTagScaleLimits(prefs.force_enable_zoom);
   settings->setAutoZoomFocusedNodeToLegibleScale(true);
   settings->setDoubleTapToZoomEnabled(prefs.double_tap_to_zoom_enabled);
   settings->setMediaControlsOverlayPlayButtonEnabled(true);
   settings->setMediaPlaybackRequiresUserGesture(
       prefs.user_gesture_required_for_media_playback);
   settings->setDefaultVideoPosterURL(
-        base::ASCIIToUTF16(prefs.default_video_poster_url.spec()));
+      base::ASCIIToUTF16(prefs.default_video_poster_url.spec()));
   settings->setSupportDeprecatedTargetDensityDPI(
       prefs.support_deprecated_target_density_dpi);
   settings->setUseLegacyBackgroundSizeShorthandBehavior(
       prefs.use_legacy_background_size_shorthand_behavior);
   settings->setWideViewportQuirkEnabled(prefs.wide_viewport_quirk);
   settings->setUseWideViewport(prefs.use_wide_viewport);
   settings->setForceZeroLayoutHeight(prefs.force_zero_layout_height);
   settings->setViewportMetaLayoutSizeQuirk(
       prefs.viewport_meta_layout_size_quirk);
   settings->setViewportMetaMergeContentQuirk(
       prefs.viewport_meta_merge_content_quirk);
   settings->setViewportMetaNonUserScalableQuirk(
       prefs.viewport_meta_non_user_scalable_quirk);
   settings->setViewportMetaZeroValuesQuirk(
       prefs.viewport_meta_zero_values_quirk);
   settings->setClobberUserAgentInitialScaleQuirk(
       prefs.clobber_user_agent_initial_scale_quirk);
   settings->setIgnoreMainFrameOverflowHiddenQuirk(
       prefs.ignore_main_frame_overflow_hidden_quirk);
   settings->setReportScreenSizeInPhysicalPixelsQuirk(
       prefs.report_screen_size_in_physical_pixels_quirk);
   settings->setShouldReuseGlobalForUnownedMainFrame(
       prefs.resue_global_for_unowned_main_frame);
   settings->setProgressBarCompletion(
       static_cast<WebSettings::ProgressBarCompletion>(
           prefs.progress_bar_completion));
   settings->setPreferHiddenVolumeControls(true);
+
+  // Force preload=none and disable autoplay on older or low end Android
+  // platforms because their media pipelines are not stable enough to handle
+  // concurrent elements. See http://crbug.com/612909, http://crbug.com/622826.
+  const bool is_low_end_device =
+      base::android::BuildInfo::GetInstance()->sdk_int() <= 18 ||

[Srirama, 2016/09/17 08:45:04]

how about using "SDK_VERSION_JELLY_BEAN_MR2" instead of 18?

[DaleCurtis, 2016/09/19 21:04:46]

Done.

+      base::SysInfo::IsLowEndDevice();
+  settings->setForcePreloadNoneForMediaElements(is_low_end_device);
   WebRuntimeFeatures::enableAutoplayMutedVideos(
-      prefs.autoplay_muted_videos_enabled);
+      prefs.autoplay_muted_videos_enabled && !is_low_end_device);
 #endif
 
   settings->setAutoplayExperimentMode(
       blink::WebString::fromUTF8(prefs.autoplay_experiment_mode));
 
   settings->setViewportEnabled(prefs.viewport_enabled);
   settings->setViewportMetaEnabled(prefs.viewport_meta_enabled);
   settings->setShrinksViewportContentToFit(
         prefs.shrinks_viewport_contents_to_fit);
   settings->setViewportStyle(
@@ skipping 1865 matching lines @@
         return render_frame->focused_pepper_plugin();
     }
     frame = frame->traverseNext(false);
   }
 
   return nullptr;
 }
 #endif
 
 }  // namespace content