Add data reduction functionality to all platforms.

chrome/browser/chrome_browser_field_trials.cc

Index: chrome/browser/chrome_browser_field_trials.cc
diff --git a/chrome/browser/chrome_browser_field_trials.cc b/chrome/browser/chrome_browser_field_trials.cc
index 655cf4564411ecff8fc0dc58aa88ac0a96d41633..9e65ba99482f68323a83f7dfb9346d10309dc208 100644
--- a/chrome/browser/chrome_browser_field_trials.cc
+++ b/chrome/browser/chrome_browser_field_trials.cc
@@ -31,6 +31,60 @@ ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
 }
 
+namespace {
+
+// Base function used by all data reduction proxy field trials. A trial is

[bengr, 2014/07/17 00:11:07]

We might be able to remove all of this.

[Not at Google. Contact bengr, 2014/07/17 18:10:21]

Discussed in person. Will figure out rollout procedure.

+// only conducted for installs that are in the "Enabled" group. They are always
+// enabled on DEV and BETA channels, and for STABLE, a percentage will be
+// controlled from the server. Until the percentage is learned from the server,
+// a client-side configuration is used.
+void DataCompressionProxyBaseFieldTrial(
+    const char* trial_name,
+    const base::FieldTrial::Probability enabled_group_probability,
+    const base::FieldTrial::Probability total_probability) {
+  const char kEnabled[] = "Enabled";
+  const char kDisabled[] = "Disabled";
+
+  // Find out if this is a stable channel.
+  const bool kIsStableChannel =
+      chrome::VersionInfo::GetChannel() == chrome::VersionInfo::CHANNEL_STABLE;
+
+  // Experiment enabled until Jan 1, 2015. By default, disabled.

[bengr, 2014/07/17 00:11:07]

We should change the expiration date to something much farther in the future.

[Not at Google. Contact bengr, 2014/07/17 18:10:21]

Changed to 2020.

+  scoped_refptr<base::FieldTrial> trial(
+      base::FieldTrialList::FactoryGetFieldTrial(
+          trial_name,
+          total_probability,
+          kDisabled, 2015, 1, 1, base::FieldTrial::ONE_TIME_RANDOMIZED, NULL));
+
+  // Non-stable channels will run with probability 1.
+  const int kEnabledGroup = trial->AppendGroup(
+      kEnabled,
+      kIsStableChannel ? enabled_group_probability : total_probability);
+
+  const int v = trial->group();
+  VLOG(1) << trial_name <<  " enabled group id: " << kEnabledGroup
+          << ". Selected group id: " << v;
+}
+
+void DataCompressionProxyFieldTrials() {
+  // Governs the rollout of the compression proxy for Chrome on mobile

[bengr, 2014/07/17 00:11:07]

all platforms, right?

[Not at Google. Contact bengr, 2014/07/17 18:10:21]

Done.

+  // platforms. In all channels, the percentage will be controlled from the
+  // server, and is configured to be 100% = 1000 / 1000 until overridden by the
+  // server.
+  DataCompressionProxyBaseFieldTrial(
+      "DataCompressionProxyRollout", 1000, 1000);
+
+  // Governs the rollout of the _promo_ for the compression proxy
+  // independently from the rollout of compression proxy. The enabled
+  // percentage is configured to be 10% = 100 / 1000 until overridden by the
+  // server. When this trial is "Enabled," users get a promo, whereas
+  // otherwise, compression is available without a promo.
+  DataCompressionProxyBaseFieldTrial(
+      "DataCompressionProxyPromoVisibility", 100, 1000);
+}
+
+}  // namespace
+
 void ChromeBrowserFieldTrials::SetupFieldTrials(PrefService* local_state) {
   const base::Time install_time = base::Time::FromTimeT(
       local_state->GetInt64(metrics::prefs::kInstallDate));
@@ -39,6 +93,7 @@ void ChromeBrowserFieldTrials::SetupFieldTrials(PrefService* local_state) {
   // Field trials that are shared by all platforms.
   chrome_variations::SetupUniformityFieldTrials(install_time);
   InstantiateDynamicTrials();
+  DataCompressionProxyFieldTrials();
 
 #if defined(OS_ANDROID) || defined(OS_IOS)
   chrome::SetupMobileFieldTrials(