Introduce chrome://flags/#enable-off-main-thread-fetch

BUG=443374 Review-Url: https://codereview.chromium.org/2897543002 Cr-Commit-Position: refs/heads/master@{#473097}
Denger-Network · May 19, 2017 · 201d494 · 201d494
1 parent c6d10d6
commit 201d494
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diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
@@ -2769,6 +2769,10 @@ const FeatureEntry kFeatureEntries[] = {
          kSpeculativeResourcePrefetchingFeatureVariations,
          "SpeculativeResourcePrefetchingValidation")},
 
+    {"enable-off-main-thread-fetch", flag_descriptions::kOffMainThreadFetchName,
+     flag_descriptions::kOffMainThreadFetchDescription, kOsAll,
+     FEATURE_VALUE_TYPE(features::kOffMainThreadFetch)},
+
 #if defined(OS_MACOSX)
     {"tab-strip-keyboard-focus", flag_descriptions::kTabStripKeyboardFocusName,
      flag_descriptions::kTabStripKeyboardFocusDescription, kOsMac,

diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
@@ -97,6 +97,12 @@ const char kSpeculativePrefetchDescription[] =
     R"*("Learning" means that only the database construction is enabled, )*"
     R"*("Prefetching" that learning and prefetching are enabled.)*";
 
+const char kOffMainThreadFetchName[] = "Off-main-thread fetch for Web Workers";
+
+const char kOffMainThreadFetchDescription[] =
+    "If enabled, the resource fetches from worker threads will not be blocked "
+    "by the busy main thread.";
+
 //  Force Tablet Mode
 
 const char kForceTabletModeName[] = "Force Tablet Mode";

diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
@@ -481,6 +481,9 @@ extern const char kOfflineAutoReloadDescription[];
 extern const char kOfflineAutoReloadVisibleOnlyName[];
 extern const char kOfflineAutoReloadVisibleOnlyDescription[];
 
+extern const char kOffMainThreadFetchName[];
+extern const char kOffMainThreadFetchDescription[];
+
 extern const char kOmniboxDisplayTitleForCurrentUrlName[];
 extern const char kOmniboxDisplayTitleForCurrentUrlDescription[];
 

diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
@@ -21846,6 +21846,7 @@ from previous Chrome versions.
   <int value="203776499" label="enable-virtual-keyboard-overscroll"/>
   <int value="223662457" label="BackgroundLoadingForDownloads:enabled"/>
   <int value="244697230" label="enable-theme-color-in-tabbed-mode"/>
+  <int value="259021228" label="OffMainThreadFetch:disabled"/>
   <int value="262382944" label="GuestViewCrossProcessFrames:disabled"/>
   <int value="266702296" label="disable-plugin-power-saver"/>
   <int value="270267831" label="enable-scripts-require-action"/>
@@ -22325,6 +22326,7 @@ from previous Chrome versions.
   <int value="1951466218" label="enable-data-reduction-proxy-lite-page"/>
   <int value="1955677113" label="trace-export-events-to-etw"/>
   <int value="1958387645" label="ScanCardsInWebPayments:enabled"/>
+  <int value="1959148757" label="OffMainThreadFetch:enabled"/>
   <int value="1960169775" label="NewPhotoPicker:disabled"/>
   <int value="1961425320" label="force-qtkit"/>
   <int value="1964816410" label="AndroidPayIntegrationV2:enabled"/>