Tracking text selection on the browser side in OOPIF.

content/public/test/text_input_test_utils.h

Index: content/public/test/text_input_test_utils.h
diff --git a/content/public/test/text_input_test_utils.h b/content/public/test/text_input_test_utils.h
index f87e9fed0fd7b7fe0c04d4c44d51e78487515e38..8cdf0d7ae16146c48bf74e7a68dfda50772e5f4b 100644
--- a/content/public/test/text_input_test_utils.h
+++ b/content/public/test/text_input_test_utils.h
@@ -53,6 +53,10 @@ class TextInputManagerTester {
   // on the TextInputManager which is being observed.
   void SetOnSelectionBoundsChangedCallback(const base::Closure& callback);
 
+  // Sets a callback which is invoked when a RWHV calls SelectionChanged on the
+  // TextInputManager which is being observed.
+  void SetOnTextSelectionChangedCallback(const base::Closure& callback);
+
   // Returns true if there is a focused <input> and populates |type| with
   // |TextInputState.type| of the TextInputManager.
   bool GetTextInputType(ui::TextInputType* type);
@@ -61,6 +65,10 @@ class TextInputManagerTester {
   // |TextInputState.value| of the TextInputManager.
   bool GetTextInputValue(std::string* value);
 
+  // Returns true if there is a focused <input> and populates |length| with the
+  // length of the selected text range in the focused view.
+  bool GetCurrentTextSelectionLength(size_t* length);
+
   // Returns the RenderWidgetHostView with a focused <input> element or nullptr
   // if none exists.
   const RenderWidgetHostView* GetActiveView();