Add enable flag for pointer events in about://flags

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 12131f38cef34f582341b31fd4a9f2d86bf4ab40..c074fb2efc836bc0b9acfdaf729f36e13f708e68 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5869,6 +5869,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_DESCRIPTION" desc="Description for the flag to enable experimental Web Platform features.">
         Enables experimental Web Platform features that are in development.
       </message>
+      <message name="IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_NAME" desc="Name for the flag to enable the experimental pointer events.">
+        Pointer Events
+      </message>
+      <message name="IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_DESCRIPTION" desc="Description for the flag to enable the experimental pointer events.">
+        Enables the experimental pointer events.

[Rick Byers, 2016/01/07 19:49:02]

Let's try to be clear here about the risk of this.  Maybe something like:
"Enables partial experimental support for the Pointer Events API.  This is
intended only for testing by web developers, it will cause some websites to be
subtly broken."

[Navid Zolghadr, 2016/01/08 16:50:09]

Done.

+      </message>
       <message name="IDS_FLAGS_EXPERIMENTAL_FRAMEWORK_NAME" desc="Name for the flag to enable the Experimental Framework.">
         Experimental Framework.
       </message>