Visual viewport API initial implementation.

third_party/WebKit/Source/core/frame/VisualViewport.idl

Index: third_party/WebKit/Source/core/frame/VisualViewport.idl
diff --git a/third_party/WebKit/Source/modules/speech/SpeechGrammarList.idl b/third_party/WebKit/Source/core/frame/VisualViewport.idl
similarity index 76%
copy from third_party/WebKit/Source/modules/speech/SpeechGrammarList.idl
copy to third_party/WebKit/Source/core/frame/VisualViewport.idl
index 48f78b8c79ae221bd177c2ca7abf37edab45b9cd..eafa02e602127ee459ecbed0f00484684756c315 100644
--- a/third_party/WebKit/Source/modules/speech/SpeechGrammarList.idl
+++ b/third_party/WebKit/Source/core/frame/VisualViewport.idl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Google Inc. All rights reserved.
+ * Copyright (C) 2016 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -23,13 +23,18 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+ // Visual Viewport API.
+ // WICG proposal: https://github.com/WICG/ViewportAPI
+
 [
-    Constructor,
+    RuntimeEnabled=VisualViewportAPI,
     GarbageCollected,
-    NoInterfaceObject,
-] interface SpeechGrammarList {
-    readonly attribute unsigned long length;
-    getter SpeechGrammar item(unsigned long index);
-    [CallWith=ExecutionContext] void addFromUri(DOMString src, optional float weight);
-    void addFromString(DOMString string, optional float weight);
+] interface VisualViewport {
+    attribute double scrollTop;
+    attribute double scrollLeft;
+
+    readonly attribute double clientWidth;
+    readonly attribute double clientHeight;
+
+    readonly attribute double pageScale;
 };