Adds us(intl_pc) IME to xkb extension.

chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json

Index: chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json
diff --git a/chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json b/chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json
index c9c720fef41a73e443b60129855418327a34d5cf..dcb6cdbe682b2b193eb103b376528add78363860 100644
--- a/chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json
+++ b/chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json
@@ -114,6 +114,22 @@
       "input_view": "inputview.html#id=us-intl&language=en-US&passwordLayout=us-intl&name=keyboard_us_international",
       "options_page": "hmm_options.html?code=xkb:us:intl:eng"
     },
+    {
+      "name": "__MSG_keyboard_us_international_pc__",
+      "type": "ime",
+      "id": "xkb:us:intl_pc:eng",
+      "indicator": "INTL",
+      "description": "",
+      "language": [
+        "en",
+        "en-US"

[Shu Chen, 2017/06/19 07:15:26]

We need to at first confirm which languages need the intl_pc behavior.
I recall pt-BR needs it.

+      ],
+      "layouts": [
+        "us(intl)"

[Shu Chen, 2017/06/19 07:15:26]

should be us(intl_pc)

+      ],
+      "input_view": "inputview.html#id=us-intl&language=en-US&passwordLayout=us-intl&name=keyboard_us_international_pc",
+      "options_page": "hmm_options.html?code=xkb:us:intl_pc:eng"
+    },
     {
       "name": "__MSG_keyboard_netherlands__",
       "type": "ime",