Adds kind-of-live thumbnail generation for a potential tab switcher.

chrome/common/transport_dib_win.cc

 // Copyright (c) 2009 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 <limits>
 #include <windows.h>
 
 #include "base/logging.h"
 #include "base/sys_info.h"
 #include "chrome/common/transport_dib.h"
+#include "skia/ext/platform_canvas.h"
 
 TransportDIB::TransportDIB() {
 }
 
 TransportDIB::~TransportDIB() {
 }
 
 TransportDIB::TransportDIB(HANDLE handle)
     : shared_memory_(handle, false /* read write */) {
 }
@@ skipping 31 matching lines @@
 
   // There doesn't seem to be any way to find the size of the shared memory
   // region! GetFileSize indicates that the handle is invalid. Thus, we
   // conservatively set the size to the maximum and hope that the renderer
   // isn't about to ask us to read off the end of the array.
   dib->size_ = std::numeric_limits<size_t>::max();
 
   return dib;
 }
 
+skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
+  return new skia::PlatformCanvas(w, h, true, handle());
+}
+
 void* TransportDIB::memory() const {
   return shared_memory_.memory();
 }
 
 TransportDIB::Handle TransportDIB::handle() const {
   return shared_memory_.handle();
 }
 
 TransportDIB::Id TransportDIB::id() const {
   return Id(shared_memory_.handle(), sequence_num_);
 }