Add use counters for Fetch API.

Add use counters for Fetch API.

This CL adds two use counters: Fetch and FetchBodyStream. Fetch counts the
number of fetch() function calls. FetchBodyStream is logged when .body
attribute is accessed in Body mixin. Note that both events in SharedWorker and
ServiceWorker are not counted.

BUG=436770, 435393
R=tyoshino

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=188602

[tyoshino (SeeGerritForStatus), 2015-01-19 05:23:02]

lgtm

[yhirano, 2015-01-19 05:23:52]

The CQ bit was checked by yhirano@chromium.org

[commit-bot: I haz the power, 2015-01-19 05:26:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/838003006/1

[commit-bot: I haz the power, 2015-01-19 05:26:11]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-01-19 05:26:12]

Failed to apply patch for Source/core/frame/UseCounter.h:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file Source/core/frame/UseCounter.h
  Hunk #1 FAILED at 611.
  1 out of 1 hunk FAILED -- saving rejects to file
Source/core/frame/UseCounter.h.rej

Patch:       Source/core/frame/UseCounter.h
Index: Source/core/frame/UseCounter.h
diff --git a/Source/core/frame/UseCounter.h b/Source/core/frame/UseCounter.h
index
5bf2fea35bc64c04fe7026028e77f4ea7eec33d6..726da92199446a10a9e11933f9a3675905c3b2d2
100644
--- a/Source/core/frame/UseCounter.h
+++ b/Source/core/frame/UseCounter.h
@@ -611,6 +611,8 @@ public:
         DeviceOrientationSecureOrigin = 671,
         SandboxViaIFrame = 672,
         SandboxViaCSP = 673,
+        Fetch = 674,
+        FetchBodyStream = 675,
 
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.

[yhirano, 2015-01-19 06:05:04]

yhirano@chromium.org changed reviewers:
+ kouhei@chromium.org

[yhirano, 2015-01-19 06:05:04]

+kouhei for core/UseCounter.h

[kouhei (in TOK), 2015-01-19 06:20:03]

lgtm. Don't forget to run
tools/metrics/histograms/update_use_counter_feature_enum.py

[yhirano, 2015-01-19 06:22:41]

On 2015/01/19 06:20:03, kouhei wrote:
> lgtm. Don't forget to run
> tools/metrics/histograms/update_use_counter_feature_enum.py

Thanks!
I have a CL: https://codereview.chromium.org/852303002/

[yhirano, 2015-01-19 06:22:54]

The CQ bit was checked by yhirano@chromium.org

[commit-bot: I haz the power, 2015-01-19 06:23:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/838003006/20001

[commit-bot: I haz the power, 2015-01-19 08:10:02]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=188602