[webhid] Add a collection type attribute

Each HID collection has an 8-bit value that defines the
collection type. This CL adds a type parameter to the collection
info exposed to javascript.

Bug: 1162143
Change-Id: I56370783aaa8bb811dc77c62ee9b0ce90d589046
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605006Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841344}

third_party/blink/renderer/modules/hid/hid_collection_info.idl

@@ -12,6 +12,9 @@ dictionary HIDCollectionInfo {
     // The 16-bit usage value associated with this collection. Zero if not set.
     unsigned short usage;
 
+    // The 8-bit collection type for this collection.
+    octet type;
+
     // The subcollections of this collection, in the order they were encountered
     // in the report descriptor.
     sequence<HIDCollectionInfo> children;

third_party/blink/renderer/modules/hid/hid_device.cc

@@ -184,6 +184,7 @@ HIDCollectionInfo* ToHIDCollectionInfo(
   HIDCollectionInfo* result = HIDCollectionInfo::Create();
   result->setUsage(collection.usage->usage);
   result->setUsagePage(collection.usage->usage_page);
+  result->setType(collection.collection_type);
 
   HeapVector<Member<HIDReportInfo>> input_reports;
   for (const auto& report : collection.input_reports)

third_party/blink/web_tests/http/tests/hid/hidDevice_deviceInfo.html

@@ -105,6 +105,7 @@ hid_test(async (t, fake) => {
   const c = d.collections[0];
   assert_equals(c.usagePage, PAGE_GENERIC_DESKTOP, 'collection.usagePage');
   assert_equals(c.usage, GENERIC_DESKTOP_GAME_PAD, 'collection.usage');
+  assert_equals(c.type, HID_COLLECTION_TYPE_APPLICATION, 'collection.type');
   assert_equals(c.children.length, 0, 'collection.children.length');
   assert_equals(c.inputReports.length, 1, 'collection.inputReports.length');
   assert_equals(c.outputReports.length, 0, 'collection.outputReports.length');