Increase number of buckets for intent-to-first-commit histogram

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 277706dc0d0fb8f3acc9f4889d0d031bff035d34..57cac6c692b24f61a46b15a65a54c50a0dc9864e 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -5711,6 +5711,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="ChromeGeneratedCustomTab.IntentToFirstCommitNavigationTime"
     units="ms">
+  <obsolete>
+    Deprecated 10/2016 in favor of .IntentToFirstCommitNavigationTime2.*.
+  </obsolete>
   <owner>lizeb@chromium.org</owner>
   <summary>
     Time between the intent arrival in a Chrome generated CCT and the first
@@ -5719,11 +5722,36 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram
+    name="ChromeGeneratedCustomTab.IntentToFirstCommitNavigationTime2.ZoomedIn"
+    units="ms">
+  <owner>lizeb@chromium.org</owner>
+  <summary>
+    In &quot;Herb&quot; mode shows the time between the intent arrival in a
+    Chrome generated CCT and the first navigation commit, if the navigation is
+    successful. Similar in principle to Startup.FirstCommitNavigationTime.
+    Zoomed in view: shorter range, more buckets.
+  </summary>
+</histogram>
+
+<histogram
+    name="ChromeGeneratedCustomTab.IntentToFirstCommitNavigationTime2.ZoomedOut"
+    units="ms">
+  <owner>lizeb@chromium.org</owner>
+  <summary>
+    In &quot;Herb&quot; mode shows the time between the intent arrival in a
+    Chrome generated CCT and the first navigation commit, if the navigation is
+    successful. Similar in principle to Startup.FirstCommitNavigationTime.
+    Zoomed out view: longer time range, less buckets.
+  </summary>
+</histogram>

[Ilya Sherman, 2016/10/13 00:46:57]

nit: Mebbe use a histogram_suffixes element to reduce the amount of duplication?

[pasko, 2016/10/13 11:47:09]

Thanks. Done. Is there an easy way to debug suffix expansion with
histograms.xml?

[Ilya Sherman, 2016/10/13 21:51:04]

I think extract_histograms.py expands out all the suffixes?  Otherwise, I'm not
sure about an easy way to debug it, as usually it's pretty straightforward.

+
 <histogram name="ChromeGeneratedCustomTab.IntentToPageLoadedTime" units="ms">
   <owner>lizeb@chromium.org</owner>
   <summary>
-    Time between the intent arrival in a Chrome generated CCT and the first
-    &quot;page loaded&quot; event, if the navigation is successful.
+    In &quot;Herb&quot; mode shows time between the intent arrival in a Chrome
+    generated CCT and the first &quot;page loaded&quot; event, if the navigation
+    is successful.
   </summary>
 </histogram>
 
@@ -7857,6 +7885,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="CustomTabs.IntentToFirstCommitNavigationTime" units="ms">
+  <obsolete>
+    Deprecated 10/2016 in favor of .IntentToFirstCommitNavigationTime2.*.
+  </obsolete>
   <owner>lizeb@chromium.org</owner>
   <summary>
     Time between the intent arrival in Chrome and the first navigation commit,
@@ -7865,11 +7896,34 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="CustomTabs.IntentToFirstCommitNavigationTime2.ZoomedIn"
+    units="ms">
+  <owner>lizeb@chromium.org</owner>
+  <summary>
+    Time between the intent arrival to a Custom Tab and the first navigation
+    commit, if the navigation is successful. Similar in principle to
+    Startup.FirstCommitNavigationTime. Non-&quot;Herb&quot; mode. Zoomed in
+    view: shorter range, more buckets.
+  </summary>
+</histogram>
+
+<histogram name="CustomTabs.IntentToFirstCommitNavigationTime2.ZoomedOut"
+    units="ms">
+  <owner>lizeb@chromium.org</owner>
+  <summary>
+    Time between the intent arrival to a Custom Tab and the first navigation
+    commit, if the navigation is successful. Similar in principle to
+    Startup.FirstCommitNavigationTime. Non-&quot;Herb&quot; mode. Zoomed out
+    view: longer time range, less buckets.
+  </summary>
+</histogram>
+
 <histogram name="CustomTabs.IntentToPageLoadedTime" units="ms">
   <owner>lizeb@chromium.org</owner>
   <summary>
     Time between the intent arrival in Chrome and the first &quot;page
-    loaded&quot; event, if the navigation is successful.
+    loaded&quot; event, if the navigation is successful. Non-&quot;Herb&quot;
+    mode.
   </summary>
 </histogram>