Implement virtual keyboard hiding.

chrome/common/extensions/api/experimental_input_virtual_keyboard.json

Index: chrome/common/extensions/api/experimental_input_virtual_keyboard.json
diff --git a/chrome/common/extensions/api/experimental_input_virtual_keyboard.json b/chrome/common/extensions/api/experimental_input_virtual_keyboard.json
index 4bd2c81e0e1180aacaf536c6333085605ea35995..b085643e47feb561efe84c1f075a8e2f60b1166f 100644
--- a/chrome/common/extensions/api/experimental_input_virtual_keyboard.json
+++ b/chrome/common/extensions/api/experimental_input_virtual_keyboard.json
@@ -23,6 +23,19 @@
             "parameters": []
           }
         ]
+      },
+      {
+        "name": "hideKeyboard",

[bryeung, 2013/08/02 17:26:39]

We shouldn't be adding APIs to this namespace.  This needs to live in a new
dev-only (for now, I assume) API namespace for the virtual keyboard.

[SteveT, 2013/08/06 18:31:34]

I'm guessing this aligns with your discussion with kevers@ about his new key
event API? We probably want to come to the same consensus and land the code in
the same place.

I'll wait and see where those discussions land with Wez and yourself before
making a change here.

+        "type": "function",
+        "description": "Hides the virtual keyboard.",
+        "parameters": [
+          { "type": "function",
+            "name": "callback",
+            "optional": true,
+            "description": "Called when the keyboard is hidden.",
+            "parameters": []
+          }
+        ]
       }
     ]
   }