Add FlushForTesting to InterfacePtr and Binding.

mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc

Index: mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc b/mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc
index aff625116863453f96ab36e88f1ed968336703bb..3a172a995572fca19192addbf17386de5a585f8a 100644
--- a/mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc
@@ -78,6 +78,8 @@ class MathCalculatorUI {
 
   double GetOutput() const { return output_; }
 
+  math::CalculatorPtr& GetInterfacePtr() { return calculator_; }
+
  private:
   void Output(const base::Closure& closure, double output) {
     output_ = output;
@@ -735,6 +737,41 @@ TEST_F(InterfacePtrTest, Fusion) {
   EXPECT_TRUE(called);
 }
 
+void Fail() {
+  FAIL() << "Unexpected connection error";
+}
+
+TEST_F(InterfacePtrTest, FlushForTesting) {
+  math::CalculatorPtr calc;
+  MathCalculatorImpl calc_impl(GetProxy(&calc));
+  calc.set_connection_error_handler(base::Bind(&Fail));
+
+  MathCalculatorUI calculator_ui(std::move(calc));
+
+  calculator_ui.Add(2.0, base::Bind(&base::DoNothing));
+  calculator_ui.GetInterfacePtr().FlushForTesting();
+  EXPECT_EQ(2.0, calculator_ui.GetOutput());
+
+  calculator_ui.Multiply(5.0, base::Bind(&base::DoNothing));
+  calculator_ui.GetInterfacePtr().FlushForTesting();
+
+  EXPECT_EQ(10.0, calculator_ui.GetOutput());
+}
+
+void SetBool(bool* value) {
+  *value = true;
+}
+
+TEST_F(InterfacePtrTest, FlushForTestingWithClosedPeer) {
+  math::CalculatorPtr calc;
+  GetProxy(&calc);
+  bool called = false;
+  calc.set_connection_error_handler(base::Bind(&SetBool, &called));
+  calc.FlushForTesting();
+  EXPECT_TRUE(called);
+  calc.FlushForTesting();
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace mojo