Add error messages for canvas creation failures

skia/ext/bitmap_platform_device_win.cc

 // Copyright (c) 2012 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 <windows.h>
 #include <psapi.h>
 #include <stddef.h>
 
 #include "base/debug/gdi_debug_util_win.h"
 #include "base/logging.h"
@@ skipping 150 matching lines @@
   HBITMAP hbitmap = NULL;
 
   // This function contains an implementation of a Skia platform bitmap for
   // drawing and compositing graphics. The original implementation uses Windows
   // GDI to create the backing bitmap memory, however it's possible for a
   // process to not have access to GDI which will cause this code to fail. It's
   // possible to detect when GDI is unavailable and instead directly map the
   // shared memory as the bitmap.
   if (base::win::IsUser32AndGdi32Available()) {
     hbitmap = CreateHBitmap(width, height, is_opaque, shared_section, &data);
-    if (!hbitmap)
+    if (!hbitmap) {
+      LOG(ERROR) << "CreateHBitmap failed";
       return NULL;
+    }
   } else {
     DCHECK(shared_section != NULL);
     data = MapViewOfFile(shared_section, FILE_MAP_WRITE, 0, 0,
                          PlatformCanvasStrideForWidth(width) * height);
-    if (!data)
+    if (!data) {
+      LOG(ERROR) << "MapViewOfFile failed";
       return NULL;
+    }
   }
 
   SkBitmap bitmap;
-  if (!InstallHBitmapPixels(&bitmap, width, height, is_opaque, data, hbitmap))
+  if (!InstallHBitmapPixels(&bitmap, width, height, is_opaque, data, hbitmap)) {
+    LOG(ERROR) << "InstallHBitmapPixels failed";
     return NULL;
+  }
 
   if (do_clear)
     bitmap.eraseColor(0);
 
 #ifndef NDEBUG
   // If we were given data, then don't clobber it!
   if (!shared_section && is_opaque)
     // To aid in finding bugs, we set the background color to something
     // obviously wrong so it will be noticable when it is not cleared
     bitmap.eraseARGB(255, 0, 255, 128);  // bright bluish green
@@ skipping 116 matching lines @@
                                int height,
                                bool is_opaque,
                                HANDLE shared_section,
                                OnFailureType failureType) {
   sk_sp<SkBaseDevice> dev(
       BitmapPlatformDevice::Create(width, height, is_opaque, shared_section));
   return CreateCanvas(dev, failureType);
 }
 
 }  // namespace skia