Misc fixes for gn builds with VS 2015

printing/printing_context_win_unittest.cc

 // Copyright (c) 2011 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 "printing/printing_context_win.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_hdc.h"
@@ skipping 100 matching lines @@
       return E_FAIL;
     void* dev_names_ptr = GlobalLock(dev_names_mem.Get());
     if (!dev_names_ptr)
       return E_FAIL;
     DEVNAMES* dev_names = reinterpret_cast<DEVNAMES*>(dev_names_ptr);
     dev_names->wDefault = 1;
     dev_names->wDriverOffset = sizeof(DEVNAMES) / sizeof(wchar_t);
     memcpy(reinterpret_cast<uint8*>(dev_names_ptr) + dev_names->wDriverOffset,
            info_2.get()->pDriverName,
            driver_size);
-    dev_names->wDeviceOffset =
-        dev_names->wDriverOffset + driver_size / sizeof(wchar_t);
+    dev_names->wDeviceOffset = base::checked_cast<WORD>(
+        dev_names->wDriverOffset + driver_size / sizeof(wchar_t));
     memcpy(reinterpret_cast<uint8*>(dev_names_ptr) + dev_names->wDeviceOffset,
            info_2.get()->pPrinterName,
            printer_size);
-    dev_names->wOutputOffset =
-        dev_names->wDeviceOffset + printer_size / sizeof(wchar_t);
+    dev_names->wOutputOffset = base::checked_cast<WORD>(
+        dev_names->wDeviceOffset + printer_size / sizeof(wchar_t));
     memcpy(reinterpret_cast<uint8*>(dev_names_ptr) + dev_names->wOutputOffset,
            info_2.get()->pPortName,
            port_size);
     GlobalUnlock(dev_names_mem.Get());
     dev_names_ptr = NULL;
 
     lppd->hDC = hdc.Take();
     lppd->hDevMode = dev_mode_mem.Take();
     lppd->hDevNames = dev_names_mem.Take();
     return S_OK;
@@ skipping 28 matching lines @@
   EXPECT_EQ(PrintingContext::OK, context->InitWithSettings(settings));
 
   // The print may lie to use and may not support world transformation.
   // Verify right now.
   XFORM random_matrix = { 1, 0.1f, 0, 1.5f, 0, 1 };
   EXPECT_TRUE(SetWorldTransform(context->context(), &random_matrix));
   EXPECT_TRUE(ModifyWorldTransform(context->context(), NULL, MWT_IDENTITY));
 }
 
 }  // namespace printing