Ensure that pepper plugins honor the GPU H/W video decode blacklist and the disable-accelerated-vid…

ppapi/shared_impl/ppapi_preferences.cc

Index: ppapi/shared_impl/ppapi_preferences.cc
===================================================================
--- ppapi/shared_impl/ppapi_preferences.cc	(revision 254462)
+++ ppapi/shared_impl/ppapi_preferences.cc	(working copy)
@@ -12,7 +12,8 @@
       number_of_cpu_cores(0),
       is_3d_supported(true),
       is_stage3d_supported(false),
-      is_stage3d_baseline_supported(false) {}
+      is_stage3d_baseline_supported(false),
+      is_accelerated_video_decode_enabled(false) {}
 
 Preferences::Preferences(const WebPreferences& prefs)
     : standard_font_family_map(prefs.standard_font_family_map),
@@ -29,7 +30,9 @@
       // and if it runs in hardware
       // (accelerated_compositing_for_plugins_enabled)
       is_webgl_supported(prefs.experimental_webgl_enabled &&
-                         prefs.accelerated_compositing_for_plugins_enabled) {}
+                         prefs.accelerated_compositing_for_plugins_enabled),
+      is_accelerated_video_decode_enabled(
+          prefs.accelerated_video_decode_enabled) {}
 
 Preferences::~Preferences() {}