bluetooth: Create bluetooth_metrics_hash tool.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index cd0e8e494d7325a35bb74f59222c5c83a3e40345..fa6fb2e8c8226679023fa77222ef50bba7bb685a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -608,7 +608,10 @@ group("gn_only") {
   deps = []
 
   if (!is_ios) {
-    deps += [ "//mojo/common:mojo_common_perftests" ]
+    deps += [
+      "//content/browser/bluetooth/tools:bluetooth_metrics_hash",

[Dirk Pranke, 2016/04/15 22:57:10]

this'll result in building an android executable on android; is that your
intent?

[scheib, 2016/04/15 23:04:43]

No, but my intent is to keep the tool and config as simple as possible. 

I attempted adding ($host_toolchain), similar to imagediff, however that caused
non-obvious tool chain errors on both the android and chrome_os build configs I
have setup. If you'd like to help sort those out to make it easier for future
tools to cut'n'paste correct setup I'm happy to do it.

Else, if we just want to keep it simple I suppose I should create a new if
(!is_android && !is_ios) section.

+      "//mojo/common:mojo_common_perftests",
+    ]
   }
 
   if (!is_android && !is_ios && !is_chromeos) {