Fix the software renderer "soft" fullscreen mode using the wrong monitor bug.

plugin/win/main_win.cc

Index: plugin/win/main_win.cc
===================================================================
--- plugin/win/main_win.cc	(revision 38988)
+++ plugin/win/main_win.cc	(working copy)
@@ -720,6 +720,25 @@
   ::ShowWindow(content_hwnd, SW_SHOW);
 }
 
+// Get the screen rect of the monitor the window is on, in virtual screen
+// coordinates.
+// Return true on success, false on failure.
+bool GetScreenRect(HWND hwnd,
+                   RECT* rect) {
+  HMONITOR monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONULL);
+  if (monitor == NULL)
+    return false;
+
+  MONITORINFO monitor_info;
+  monitor_info.cbSize = sizeof(monitor_info);
+  if (GetMonitorInfo(monitor, &monitor_info)) {
+    *rect = monitor_info.rcMonitor;
+    return true;
+  } else {
+    return false;
+  }
+}
+
 }  // namespace anonymous
 
 #if defined(O3D_INTERNAL_PLUGIN)
@@ -958,10 +977,12 @@
     // We need to resize the full-screen window to the desired size of
     // the display mode early, before calling
     // Renderer::GoFullscreen().
-    o3d::DisplayMode mode;
-    if (GetDisplayMode(fullscreen_region_mode_id_, &mode)) {
-      ::SetWindowPos(GetContentHWnd(), HWND_TOP, 0, 0,
-                     mode.width(), mode.height(),
+    RECT screen_rect;
+    if (GetScreenRect(GetPluginHWnd(), &screen_rect)) {
+      ::SetWindowPos(GetContentHWnd(), HWND_TOP,
+                     screen_rect.left, screen_rect.top,
+                     screen_rect.right - screen_rect.left + 1,
+                     screen_rect.bottom - screen_rect.top + 1,
                      SWP_NOZORDER | SWP_NOREPOSITION | SWP_ASYNCWINDOWPOS);
       DisplayWindowWindows display;
       display.set_hwnd(GetContentHWnd());