Move Bluetooth.Web.FunctionCall.Count UMA from browser to WebKit

third_party/WebKit/Source/modules/bluetooth/DEPS

Index: third_party/WebKit/Source/modules/bluetooth/DEPS
diff --git a/third_party/WebKit/Source/modules/bluetooth/DEPS b/third_party/WebKit/Source/modules/bluetooth/DEPS
index 5c219f5236ba95a26b211919fa6f91d0cb720c34..e13fd27380d774ae6c611d7dc22fa4719a10c44b 100644
--- a/third_party/WebKit/Source/modules/bluetooth/DEPS
+++ b/third_party/WebKit/Source/modules/bluetooth/DEPS
@@ -1,4 +1,5 @@
 include_rules = [
+    "+base/metrics/histogram_macros.h",

[ortuno, 2017/03/24 05:48:04]

I'm surprised we are allowed to add this. If I understand correctly we are not
allowed to use base in blink. Looking around the modules folder I don't see any
other deps that have base in them. There have been many threads in the past
whenever someone tried to add a new dependency on base:

https://groups.google.com/a/chromium.org/d/msg/blink-dev/pScbOlA-1AE/rZK9Hba1...

https://groups.google.com/a/chromium.org/d/msg/blink-dev/rjy64WpOfSc/3ZRA09iD...

https://groups.google.com/a/chromium.org/d/msg/blink-dev/klpywegl4Nc/xUrBycH-...

This was also the main reason we ended up doing all the histogramming on the
browser side.

[scheib, 2017/03/24 19:53:31]

However, if we did want to preserve our old UMA values, and use the initial
approach of this CL, I think it would be worth a discussion with OWNERS about
adding a dep to base/metrics:

WebKit/Source/Platform already uses metrics.
https://cs.chromium.org/search/?q=f:webkit+f:deps+base%5C/metrics&type=cs

Before we did the repo-merge we exposed histograms to WebKit via wrappers. 
WebKit/Source/platform/Histogram.h has them now, but it also seems to be extra
layers we shouldn't use now that we've integrated the codebase.

[juncai, 2017/03/27 19:08:57]

I added a post at blink-dev:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/qX_3Uavx96U

     "+bindings",
     "+core",
     "+device/bluetooth/public/interfaces",