Parametrize Suggest polling strategy and delay. Also add a parameter

components/omnibox/omnibox_field_trial.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 "components/omnibox/omnibox_field_trial.h"
 
 #include <cmath>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 318 matching lines @@
       kBundledExperimentFieldTrialName,
       kAddUWYTMatchEvenIfPromotedURLsRule) == "true";
 }
 
 bool OmniboxFieldTrial::DisplayHintTextWhenPossible() {
   return variations::GetVariationParamValue(
       kBundledExperimentFieldTrialName,
       kDisplayHintTextWhenPossibleRule) == "true";
 }
 
+bool OmniboxFieldTrial::DisableResultsCaching() {
+  return variations::GetVariationParamValue(
+      kBundledExperimentFieldTrialName,
+      kDisableResultsCachingRule) == "true";
+}
+
+void OmniboxFieldTrial::GetSuggestPollingStrategy(bool* from_last_keystroke,
+                                                  int* polling_delay_ms) {
+  *from_last_keystroke = variations::GetVariationParamValue(
+      kBundledExperimentFieldTrialName,
+      kMeasureSuggestPollingDelayFromLastKeystrokeRule) == "true";
+
+  const std::string& polling_delay_string = variations::GetVariationParamValue(
+      kBundledExperimentFieldTrialName,
+      kSuggestPollingDelayMsRule);
+  if (polling_delay_string.empty() ||
+      !base::StringToInt(polling_delay_string, polling_delay_ms) ||
+      (*polling_delay_ms <= 0)) {
+    *polling_delay_ms = kDefaultMinimumTimeBetweenSuggestQueriesMs;
+  }
+}
+
 const char OmniboxFieldTrial::kBundledExperimentFieldTrialName[] =
     "OmniboxBundledExperimentV1";
 const char OmniboxFieldTrial::kShortcutsScoringMaxRelevanceRule[] =
     "ShortcutsScoringMaxRelevance";
 const char OmniboxFieldTrial::kSearchHistoryRule[] = "SearchHistory";
 const char OmniboxFieldTrial::kDemoteByTypeRule[] = "DemoteByType";
 const char OmniboxFieldTrial::kHQPBookmarkValueRule[] =
     "HQPBookmarkValue";
 const char OmniboxFieldTrial::kHQPAllowMatchInTLDRule[] = "HQPAllowMatchInTLD";
 const char OmniboxFieldTrial::kHQPAllowMatchInSchemeRule[] =
     "HQPAllowMatchInScheme";
 const char OmniboxFieldTrial::kZeroSuggestRule[] = "ZeroSuggest";
 const char OmniboxFieldTrial::kZeroSuggestVariantRule[] = "ZeroSuggestVariant";
 const char OmniboxFieldTrial::kDisableInliningRule[] = "DisableInlining";
 const char OmniboxFieldTrial::kAnswersInSuggestRule[] = "AnswersInSuggest";
 const char OmniboxFieldTrial::kAddUWYTMatchEvenIfPromotedURLsRule[] =
     "AddUWYTMatchEvenIfPromotedURLs";
 const char OmniboxFieldTrial::kDisplayHintTextWhenPossibleRule[] =
     "DisplayHintTextWhenPossible";
+const char OmniboxFieldTrial::kDisableResultsCachingRule[] =
+    "DisableResultsCaching";
+const char
+OmniboxFieldTrial::kMeasureSuggestPollingDelayFromLastKeystrokeRule[] =
+    "MeasureSuggestPollingDelayFromLastKeystroke";
+const char OmniboxFieldTrial::kSuggestPollingDelayMsRule[] =
+    "SuggestPollingDelayMs";
 
 const char OmniboxFieldTrial::kHUPNewScoringEnabledParam[] =
     "HUPExperimentalScoringEnabled";
 const char OmniboxFieldTrial::kHUPNewScoringTypedCountRelevanceCapParam[] =
     "TypedCountRelevanceCap";
 const char OmniboxFieldTrial::kHUPNewScoringTypedCountHalfLifeTimeParam[] =
     "TypedCountHalfLifeTime";
 const char OmniboxFieldTrial::kHUPNewScoringTypedCountScoreBucketsParam[] =
     "TypedCountScoreBuckets";
 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountRelevanceCapParam[] =
     "VisitedCountRelevanceCap";
 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountHalfLifeTimeParam[] =
     "VisitedCountHalfLifeTime";
 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountScoreBucketsParam[] =
     "VisitedCountScoreBuckets";
 
+// static
+int OmniboxFieldTrial::kDefaultMinimumTimeBetweenSuggestQueriesMs = 100;
+
 // Background and implementation details:
 //
 // Each experiment group in any field trial can come with an optional set of
 // parameters (key-value pairs).  In the bundled omnibox experiment
 // (kBundledExperimentFieldTrialName), each experiment group comes with a
 // list of parameters in the form:
 //   key=<Rule>:
 //       <OmniboxEventProto::PageClassification (as an int)>:
 //       <whether Instant Extended is enabled (as a 1 or 0)>
 //     (note that there are no linebreaks in keys; this format is for
@@ skipping 42 matching lines @@
   if (it != params.end())
     return it->second;
   // Fall back to the global instant extended context.
   it = params.find(rule + ":" + page_classification_str + ":*");
   if (it != params.end())
     return it->second;
   // Look up rule in the global context.
   it = params.find(rule + ":*:*");
   return (it != params.end()) ? it->second : std::string();
 }