Unit test for PresentationDispatcher

This CL adds test cases for methods in the blink::WebPresentationClient
interface implemented by PresentationDispatcher.

BUG=576808

Review-Url: https://codereview.chromium.org/2597853002
Cr-Commit-Position: refs/heads/master@{#441752}

content/renderer/presentation/presentation_dispatcher.h

@@ -36,6 +36,8 @@ class WebVector;
 
 namespace content {
 
+class TestPresentationDispatcher;
+
 // PresentationDispatcher is a delegate for Presentation API messages used by
 // Blink. It forwards the calls to the Mojo PresentationService.
 class CONTENT_EXPORT PresentationDispatcher
@@ -47,6 +49,21 @@ class CONTENT_EXPORT PresentationDispatcher
   ~PresentationDispatcher() override;
 
  private:
+  friend class TestPresentationDispatcher;
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestStartSession);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestStartSessionError);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestJoinSession);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestJoinSessionError);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestSendString);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestSendArrayBuffer);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestSendBlobData);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestCloseSession);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest, TestTerminateSession);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest,
+                           TestListenForScreenAvailability);
+  FRIEND_TEST_ALL_PREFIXES(PresentationDispatcherTest,
+                           TestSetDefaultPresentationUrls);
+
   struct SendMessageRequest {
     SendMessageRequest(blink::mojom::PresentationSessionInfoPtr session_info,
                        blink::mojom::ConnectionMessagePtr message);
@@ -137,7 +154,7 @@ class CONTENT_EXPORT PresentationDispatcher
   void DoSendMessage(SendMessageRequest* request);
   void HandleSendMessageRequests(bool success);
 
-  void ConnectToPresentationServiceIfNeeded();
+  virtual void ConnectToPresentationServiceIfNeeded();
 
   void UpdateListeningState();
 

content/test/BUILD.gn

@@ -1357,6 +1357,7 @@ test("content_unittests") {
     "../renderer/media/video_capture_impl_unittest.cc",
     "../renderer/media/webmediaplayer_ms_unittest.cc",
     "../renderer/peripheral_content_heuristic_unittest.cc",
+    "../renderer/presentation/presentation_dispatcher_unittest.cc",
     "../renderer/render_thread_impl_unittest.cc",
     "../renderer/render_widget_unittest.cc",
     "../renderer/scheduler/resource_dispatch_throttler_unittest.cc",