Instrument direct surfaces of InputDeviceCapabilities.

Bug: 973801
Change-Id: I737230362b82edd24616197f540ffe330b72c66d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363814Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800206}

third_party/blink/renderer/core/input/input_device_capabilities.idl

@@ -19,5 +19,5 @@
     // Whether this device dispatches touch events for movement.  This is used to detect
     // mouse events which represent only an action that has already been handled  by
     // touch event handlers.
-    [Measure] readonly attribute boolean firesTouchEvents;
+    [HighEntropy=Direct, Measure] readonly attribute boolean firesTouchEvents;
 };