Second attempt at fixing pointer lock issues with Windows HiDPI.

content/browser/renderer_host/input/web_input_event_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/command_line.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "ui/events/event_constants.h"
+#include "ui/gfx/switches.h"
+
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#include "content/browser/renderer_host/input/web_input_event_builders_win.h"
+#endif
+
+using blink::WebMouseEvent;
+
+namespace content {
+
+#if defined(OS_WIN)
+// This test validates that Pixel to DIP conversion occurs as needed in the
+// WebMouseEventBuilder::Build function.
+TEST(WebInputEventBuilderTest, TestMouseEventScale) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN7)
+    return;
+
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  command_line->AppendSwitchASCII(switches::kForceDeviceScaleFactor, "2");
+
+  // Synthesize a mouse move with x = 300 and y = 200.
+  WebMouseEvent mouse_move =
+      WebMouseEventBuilder::Build(::GetDesktopWindow(), WM_MOUSEMOVE, 0,
+                                  MAKELPARAM(300, 200), 100);
+
+  // The WebMouseEvent.x, WebMouseEvent.y, WebMouseEvent.windowX and
+  // WebMouseEvent.windowY fields should be in pixels on return and hence
+  // should be the same value as the x and y coordinates passed in to the
+  // WebMouseEventBuilder::Build function.
+  EXPECT_EQ(300, mouse_move.x);
+  EXPECT_EQ(200, mouse_move.y);
+
+  EXPECT_EQ(300, mouse_move.windowX);
+  EXPECT_EQ(200, mouse_move.windowY);
+
+  // WebMouseEvent.globalX and WebMouseEvent.globalY are calculated in DIPs.
+  EXPECT_EQ(150, mouse_move.globalX);
+  EXPECT_EQ(100, mouse_move.globalY);
+
+  command_line->AppendSwitchASCII(switches::kForceDeviceScaleFactor, "1");
+}
+#endif
+
+}  // namespace content