Remove unused Chrome histograms Renderer4..*

Remove the following metrics:
Renderer4.CompositorThreadImplDrawDelay (99th percentile by size)
Renderer4.LanguageDetection (95th percentile by size)
Renderer4.SoftwareCompositorThreadImplDrawDelay (85th percentile by size)

Bug: 851784
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I99947370afa55bea137f99a317983db11292e33e
Reviewed-on: https://chromium-review.googlesource.com/1112203Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Michael Martis <martis@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572287}

cc/trees/frame_rate_counter.cc

@@ -57,18 +57,6 @@ void FrameRateCounter::SaveTimeStamp(base::TimeTicks timestamp, bool software) {
   base::TimeDelta frame_interval_seconds =
       RecentFrameInterval(ring_buffer_.BufferSize() - 1);
 
-  if (has_impl_thread_ && ring_buffer_.CurrentIndex() > 0) {
-    if (software) {
-      UMA_HISTOGRAM_CUSTOM_COUNTS(
-          "Renderer4.SoftwareCompositorThreadImplDrawDelay",
-          frame_interval_seconds.InMilliseconds(), 1, 120, 60);
-    } else {
-      UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.CompositorThreadImplDrawDelay",
-                                  frame_interval_seconds.InMilliseconds(), 1,
-                                  120, 60);
-    }
-  }
-
   if (!IsBadFrameInterval(frame_interval_seconds) &&
       frame_interval_seconds.InSecondsF() > kDroppedFrameTime)
     dropped_frame_count_ +=

components/translate/core/common/translate_metrics.cc

@@ -18,7 +18,6 @@ namespace translate {
 
 namespace metrics_internal {
 
-const char kRenderer4LanguageDetection[] = "Renderer4.LanguageDetection";
 const char kTranslateContentLanguage[] = "Translate.ContentLanguage";
 const char kTranslateHtmlLang[] = "Translate.HtmlLang";
 const char kTranslateLanguageVerification[] = "Translate.LanguageVerification";
@@ -102,11 +101,6 @@ void ReportPageScheme(const std::string& scheme) {
                             SCHEME_MAX);
 }
 
-void ReportLanguageDetectionTime(base::TimeTicks begin, base::TimeTicks end) {
-  UMA_HISTOGRAM_MEDIUM_TIMES(metrics_internal::kRenderer4LanguageDetection,
-                             end - begin);
-}
-
 void ReportSimilarLanguageMatch(bool match) {
   UMA_HISTOGRAM_BOOLEAN(metrics_internal::kTranslateSimilarLanguageMatch,
                         match);

components/translate/core/common/translate_metrics.h

@@ -16,7 +16,6 @@ namespace translate {
 namespace metrics_internal {
 
 // Constant string values to indicate UMA names.
-extern const char kRenderer4LanguageDetection[];
 extern const char kTranslateContentLanguage[];
 extern const char kTranslateHtmlLang[];
 extern const char kTranslateLanguageVerification[];
@@ -92,9 +91,6 @@ void ReportUserActionDuration(base::TimeTicks begin, base::TimeTicks end);
 // Called when a translation is triggered.
 void ReportPageScheme(const std::string& scheme);
 
-// Called when CLD detects page language.
-void ReportLanguageDetectionTime(base::TimeTicks begin, base::TimeTicks end);
-
 // Called when CLD agreed on a language which is different, but in the similar
 // language list.
 void ReportSimilarLanguageMatch(bool match);

components/translate/core/common/translate_metrics_unittest.cc

@@ -279,17 +279,6 @@ TEST(TranslateMetricsTest, ReportSimilarLanguageMatch) {
   EXPECT_EQ(1, recorder.GetCount(kFalse));
 }
 
-TEST(TranslateMetricsTest, ReportLanguageDetectionTime) {
-  MetricsRecorder recorder(
-      translate::metrics_internal::kRenderer4LanguageDetection);
-  recorder.CheckTotalCount(0);
-  TimeTicks begin = TimeTicks::Now();
-  TimeTicks end = begin + base::TimeDelta::FromMicroseconds(9009);
-  translate::ReportLanguageDetectionTime(begin, end);
-  recorder.CheckValueInLogs(9.009);
-  recorder.CheckTotalCount(1);
-}
-
 TEST(TranslateMetricsTest, ReportLanguageDetectionConflict) {
   MetricsRecorder recorder(
       translate::metrics_internal::kTranslateLanguageDetectionConflict);

components/translate/core/language_detection/language_detection_util.cc

@@ -15,7 +15,6 @@
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/time/time.h"
 #include "components/translate/core/common/translate_constants.h"
 #include "components/translate/core/common/translate_metrics.h"
 #include "components/translate/core/common/translate_util.h"
@@ -152,7 +151,6 @@ std::string DeterminePageLanguage(const std::string& code,
                                   const base::string16& contents,
                                   std::string* cld_language_p,
                                   bool* is_cld_reliable_p) {
-  base::TimeTicks begin_time = base::TimeTicks::Now();
   bool is_cld_reliable;
   // Check if html lang attribute is valid.
   std::string modified_html_lang;
@@ -172,7 +170,6 @@ std::string DeterminePageLanguage(const std::string& code,
   }
 
   std::string cld_language = DetermineTextLanguage(contents, &is_cld_reliable);
-  translate::ReportLanguageDetectionTime(begin_time, base::TimeTicks::Now());
 
   if (cld_language_p != nullptr)
     *cld_language_p = cld_language;

tools/metrics/histograms/histograms.xml

@@ -78785,6 +78785,10 @@ uploading your change for review.
 </histogram>
 
 <histogram name="Renderer4.CompositorThreadImplDrawDelay" units="ms">
+  <obsolete>
+    Deprecated in 06/2018, M69. Renderer4.CompositorThreadImplDrawDelay is no
+    longer needed due to issue 851784.
+  </obsolete>
   <owner>wiltzius@chromium.org</owner>
   <summary>
     Time between frames, as measured on the compositor thread. This is collected
@@ -79062,6 +79066,10 @@ uploading your change for review.
 </histogram>
 
 <histogram name="Renderer4.LanguageDetection" units="ms">
+  <obsolete>
+    Deprecated in 06/2018, M69. Renderer4.LanguageDetection is no longer needed
+    due to issue 851784.
+  </obsolete>
   <owner>wiltzius@chromium.org</owner>
   <summary>
     Time to determine the page language. This is done after the page has been
@@ -79247,6 +79255,10 @@ uploading your change for review.
 </histogram>
 
 <histogram name="Renderer4.SoftwareCompositorThreadImplDrawDelay" units="ms">
+  <obsolete>
+    Deprecated in 06/2018, M69. Renderer4.SoftwareCompositorThreadImplDrawDelay
+    is no longer needed due to issue 851784.
+  </obsolete>
   <owner>wiltzius@chromium.org</owner>
   <summary>
     Time between frames when the software renderer is being used, as measured on