Add setSelection function to automation API.

chrome/common/extensions/api/automation.idl

Index: chrome/common/extensions/api/automation.idl
diff --git a/chrome/common/extensions/api/automation.idl b/chrome/common/extensions/api/automation.idl
index b49c3a5e179c58bd70ee76efc89f179bfb0eda68..8887cf1637c1b5861abf8c5d49c2e8913bd69bd5 100644
--- a/chrome/common/extensions/api/automation.idl
+++ b/chrome/common/extensions/api/automation.idl
@@ -276,6 +276,18 @@
     object? attributes;
   };
 
+  // Arguments for the setDocumentSelection() function.
+  [nocompile, noinline_doc] dictionary SetDocumentSelectionParams {
+    // The node where the selection begins.
+    [instanceOf=AutomationNode] object anchorObject;
+    // The offset in the anchor node where the selection begins.
+    long anchorOffset;
+    // The node where the selection ends.
+    [instanceOf=AutomationNode] object focusObject;
+    // The offset within the focus node where the selection ends.
+    long focusOffset;
+  };
+
   // Called when the result for a <code>query</code> is available.
   callback QueryCallback = void(AutomationNode node);
 
@@ -312,7 +324,7 @@
     // The root node of the tree containing this AutomationNode.
     AutomationNode root;
 
-    // Whether this AutomationNode is root node.
+    // Whether this AutomationNode is a root node.
     boolean isRootNode;
 
     // The role of this node.
@@ -422,6 +434,19 @@
     DOMString textInputType;
 
     //
+    // Tree selection attributes (available on root nodes only)
+    //
+
+    // The anchor node of the tree selection, if any.
+    AutomationNode? anchorObject;
+    // The anchor offset of the tree selection, if any.
+    long? anchorOffset;
+    // The focus node of the tree selection, if any.
+    AutomationNode? focusObject;
+    // The focus offset of the tree selection, if any.
+    long? focusOffset;
+
+    //
     // Range attributes.
     //
 
@@ -553,5 +578,16 @@
     // Remove a tree change observer.
     [nocompile] static void removeTreeChangeObserver(
         TreeChangeObserver observer);
+
+    // Sets the selection in a tree. This creates a selection in a single
+    // tree (anchorObject and focusObject must have the same root).
+    // Everything in the tree between the two node/offset pairs gets included
+    // in the selection. The anchor is where the user started the selection,
+    // while the focus is the point at which the selection gets extended
+    // e.g. when dragging with a mouse or using the keyboard. For nodes with
+    // the role staticText, the offset gives the character offset within
+    // the value where the selection starts or ends, respectively.
+    [nocompile] static void setDocumentSelection(
+        SetDocumentSelectionParams params);
   };
 };