OSWindow: add optional debugging of events received

BUG=angleproject:830

Change-Id: Icd854ee152f15ec1de4293b5ed2ed49cb1a5fc2b
Reviewed-on: https://chromium-review.googlesource.com/270451
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>

util/OSWindow.cpp

@@ -6,6 +6,101 @@
 
 #include "OSWindow.h"
 
+#include <iostream>
+
+#include "common/debug.h"
+
+#ifndef DEBUG_EVENTS
+#define DEBUG_EVENTS 0
+#endif
+
+#if DEBUG_EVENTS
+static const char *MouseButtonName(MouseButton button)
+{
+    switch (button)
+    {
+      case MOUSEBUTTON_UNKNOWN:
+        return "Unknown";
+      case MOUSEBUTTON_LEFT:
+        return "Left";
+      case MOUSEBUTTON_RIGHT:
+        return "Right";
+      case MOUSEBUTTON_MIDDLE:
+        return "Middle";
+      case MOUSEBUTTON_BUTTON4:
+        return "Button4";
+      case MOUSEBUTTON_BUTTON5:
+        return "Button5";
+      default:
+        UNREACHABLE();
+        return nullptr;
+    }
+}
+
+static void PrintEvent(const Event& event)
+{
+    switch (event.Type)
+    {
+      case Event::EVENT_CLOSED:
+        std::cout << "Event: Window Closed" << std::endl;
+        break;
+      case Event::EVENT_MOVED:
+        std::cout << "Event: Window Moved (" << event.Move.X
+                  << ", " << event.Move.Y << ")" << std::endl;
+        break;
+      case Event::EVENT_RESIZED:
+        std::cout << "Event: Window Resized (" << event.Size.Width
+                  << ", " << event.Size.Height << ")" << std::endl;
+        break;
+      case Event::EVENT_LOST_FOCUS:
+        std::cout << "Event: Window Lost Focus" << std::endl;
+        break;
+      case Event::EVENT_GAINED_FOCUS:
+        std::cout << "Event: Window Gained Focus" << std::endl;
+        break;
+      case Event::TEXT_ENTERED:
+        // TODO(cwallez) show the character
+        std::cout << "Event: Text Entered" << std::endl;
+        break;
+      case Event::EVENT_KEY_PRESSED:
+        // TODO(cwallez) show the key
+        std::cout << "Event: Key Pressed" << std::endl;
+        break;
+      case Event::EVENT_KEY_RELEASED:
+        // TODO(cwallez) show the key
+        std::cout << "Event: Key Released" << std::endl;
+        break;
+      case Event::EVENT_MOUSE_WHEEL_MOVED:
+        std::cout << "Event: Mouse Wheel (" << event.MouseWheel.Delta << ")" << std::endl;
+        break;
+      case Event::EVENT_MOUSE_BUTTON_PRESSED:
+        std::cout << "Event: Mouse Button Pressed " << MouseButtonName(event.MouseButton.Button) <<
+                  " at (" << event.MouseButton.X << ", " << event.MouseButton.Y << ")" << std::endl;
+        break;
+      case Event::EVENT_MOUSE_BUTTON_RELEASED:
+        std::cout << "Event: Mouse Button Released " << MouseButtonName(event.MouseButton.Button) <<
+                  " at (" << event.MouseButton.X << ", " << event.MouseButton.Y << ")" << std::endl;
+        break;
+      case Event::EVENT_MOUSE_MOVED:
+        std::cout << "Event: Mouse Moved (" << event.MouseMove.X
+                  << ", " << event.MouseMove.Y << ")" << std::endl;
+        break;
+      case Event::EVENT_MOUSE_ENTERED:
+        std::cout << "Event: Mouse Entered Window" << std::endl;
+        break;
+      case Event::EVENT_MOUSE_LEFT:
+        std::cout << "Event: Mouse Left Window" << std::endl;
+        break;
+      case Event::EVENT_TEST:
+        std::cout << "Event: Test" << std::endl;
+        break;
+      default:
+        UNREACHABLE();
+        break;
+    }
+}
+#endif
+
 OSWindow::OSWindow()
     : mX(0),
       mY(0),
@@ -68,6 +163,10 @@ void OSWindow::pushEvent(Event event)
     }
 
     mEvents.push_back(event);
+
+#if DEBUG_EVENTS
+    PrintEvent(event);
+#endif
 }
 
 bool OSWindow::didTestEventFire()