Add manifest and permission features for ChromeVox

Adding some missing manifest and permission features that
ChromeVox needs on chromecast.

Bug: b/73383411
Test: None
Change-Id: I2d85e18fcec6dceb02dccec551838ebca418aaab
Reviewed-on: https://chromium-review.googlesource.com/1093272Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567270}

chromecast/common/extensions_api/_manifest_features.json

@@ -23,5 +23,20 @@
   "content_scripts": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
+  },
+  "commands": {
+    "channel": "stable",
+    "extension_types": ["extension", "platform_app"],
+    "min_manifest_version": 2
+  },
+  "options_page": {
+    "channel": "stable",
+    "extension_types": [
+      "extension", "legacy_packaged_app", "hosted_app"
+    ]
+  },
+  "tts_engine": {
+    "channel": "stable",
+    "extension_types": ["platform_app", "extension", "legacy_packaged_app"]
   }
 }

chromecast/common/extensions_api/_permission_features.json

@@ -6,7 +6,7 @@
   "accessibilityPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
-    "whitelist": [ "2FCBCE08B34CCA1728A85F1EFBD9A34DD2558B2E" ]
+    "whitelist" : [ "75C7F4B720314B6CB1B5817CD86089DB95CD2461" ] // built-in chromevox
   },
   "bookmarks": {
     "channel": "stable",
@@ -29,6 +29,37 @@
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
+  "clipboardRead": {
+    "channel": "stable",
+    "extension_types": [
+      "extension", "legacy_packaged_app", "hosted_app", "platform_app"
+    ]
+  },
+  "commands.accessibility": {
+    "channel": "stable",
+    "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
+    "whitelist" : [
+      "75C7F4B720314B6CB1B5817CD86089DB95CD2461"  // built-in chromevox
+    ]
+  },
+  "commandLinePrivate": {
+    "channel": "stable",
+    "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
+    "location": "component"
+  },
+  "experimental": {
+    "channel": "stable",
+    "command_line_switch": "experimental-extension-apis",
+    "extension_types": [
+      "extension", "legacy_packaged_app", "hosted_app", "platform_app"
+    ]
+  },
+  "notifications": {
+    "channel": "stable",
+    "extension_types": [
+      "extension", "legacy_packaged_app", "hosted_app", "platform_app"
+    ]
+  },
   "tabs": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]