Reland: WebFonts cache-aware timeout adaptation

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index a257019c63972e4a84af1c22d877dff0fd285c0c..385764146d39f5fe16305b2e923791b1f2798c02 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -72189,6 +72189,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="WebFont.LoadLimitOnDiskCacheMiss" enum="WebFontLoadLimitState">
+  <owner>ksakamoto@chromium.org</owner>
+  <owner>shaochuan@chromium.org</owner>
+  <owner>toyoshim@chromium.org</owner>
+  <summary>
+    The load limit state when the first disk-cache-only request fails by cache
+    miss, if WebFonts cache-aware timeout adaptation is enabled and applicable.
+  </summary>
+</histogram>
+
 <histogram name="WebFont.LoadTime.0.Under10KB" units="ms">
   <obsolete>
     Deprecated as of 8/2013, replaced by WebFont.DownloadTime.0.Under10KB.
@@ -105644,6 +105654,13 @@ value.
   <int value="3" label="Was triggered, and would time out"/>
 </enum>
 
+<enum name="WebFontLoadLimitState" type="int">
+  <int value="0" label="Load not started"/>
+  <int value="1" label="Under limit"/>
+  <int value="2" label="Short limit exceeded"/>
+  <int value="3" label="Long limit exceeded"/>
+</enum>
+
 <enum name="WebFontPackageFormat" type="int">
   <int value="0" label="Unknown / Decode error"/>
   <int value="1" label="SFNT"/>