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 97b1da1a76da600d20012d722a49a0c3db3c35b0..1f36862e9bfb36087b9e15f5243f1a3365529f06 100644
--- a/content/public/test/text_input_test_utils.h
+++ b/content/public/test/text_input_test_utils.h
@@ -78,6 +78,10 @@ class TextInputManagerTester {
   // ImeCompositionRangeChanged on the TextInputManager that is being observed.
   void SetOnImeCompositionRangeChangedCallback(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);
@@ -86,6 +90,10 @@ 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);
+

[EhsanK, 2016/07/18 15:21:29]

TextSelection could be for non-<input> but as far as I can tell we do not care
about them in IME. So I made this return true only when we have an
|active_view_|.

   // Returns the RenderWidgetHostView with a focused <input> element or nullptr
   // if none exists.
   const RenderWidgetHostView* GetActiveView();