Enable Windows Flash hw video decode trial.

chrome/browser/chrome_browser_field_trials_desktop.cc

 // Copyright 2013 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/chrome_browser_field_trials_desktop.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/environment.h"
@@ skipping 49 matching lines @@
 }
 
 void DisableShowProfileSwitcherTrialIfNecessary() {
   // This trial is created by the VariationsService, but it needs to be disabled
   // if multi-profiles isn't enabled.
   base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
   if (trial && !profiles::IsMultipleProfilesEnabled())
     trial->Disable();
 }
 
-void SetupLowLatencyFlashAudioFieldTrial() {
+void SetupFlashHardwareVideoDecodeFieldTrial() {
+#if defined(OS_WIN)
+  // End this trial on a patch Tuesday.
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial(
-          content::kLowLatencyFlashAudioFieldTrialName, 100, "Standard",
-          2013, 9, 1, base::FieldTrial::SESSION_RANDOMIZED, NULL));
+          content::kFlashHwVideoDecodeFieldTrialName, 100, "Standard",
+          2014, 6, 10, base::FieldTrial::ONE_TIME_RANDOMIZED, NULL));

[Alexei Svitkine (slow), 2014/01/22 16:27:24]

It's better to initialize field trials entirely from the server, unless there's
a really good reason against that (which I don't think there is in this case).

If the trial is set up from the server, then this block of code is not needed at
all and can be removed.

 
-  // Trial is enabled for dev / beta / canary users only.
-  if (chrome::VersionInfo::GetChannel() != chrome::VersionInfo::CHANNEL_STABLE)
-    trial->AppendGroup(content::kLowLatencyFlashAudioFieldTrialEnabledName, 25);
+  // Hardware decode is enabled for Windows canary/dev/unbranded users. On beta
+  // channel it is enabled with 50% and on stable with 1% probability.
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+  if (channel == chrome::VersionInfo::CHANNEL_STABLE)
+      trial->AppendGroup(content::kFlashHwVideoDecodeFieldTrialEnabledName, 1);
+  else if (channel == chrome::VersionInfo::CHANNEL_BETA)
+    trial->AppendGroup(content::kFlashHwVideoDecodeFieldTrialEnabledName, 50);
+  else
+    trial->AppendGroup(content::kFlashHwVideoDecodeFieldTrialEnabledName, 100);
+#endif  // defined(OS_WIN)
 }
 
 void SetupPreReadFieldTrial() {
   // The chrome executable will have set (or not) an environment variable with
   // the group name into which this client belongs.
   std::string group;
   scoped_ptr<base::Environment> env(base::Environment::Create());
   if (!env->GetVar(chrome::kPreReadEnvironmentVariable, &group) ||
       group.empty()) {
     return;
@@ skipping 37 matching lines @@
 
 void SetupDesktopFieldTrials(const CommandLine& parsed_command_line,
                              const base::Time& install_time,
                              PrefService* local_state) {
   prerender::ConfigurePrerender(parsed_command_line);
   AutoLaunchChromeFieldTrial();
   OmniboxFieldTrial::ActivateStaticTrials();
   SetupInfiniteCacheFieldTrial();
   DisableShowProfileSwitcherTrialIfNecessary();
   SetupShowAppLauncherPromoFieldTrial(local_state);
-  SetupLowLatencyFlashAudioFieldTrial();
+  SetupFlashHardwareVideoDecodeFieldTrial();
   SetupPreReadFieldTrial();
 }
 
 }  // namespace chrome