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

chrome/common/transport_dib_mac.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 "chrome/common/transport_dib.h"
 
 #include <unistd.h>
 #include <sys/stat.h>
 
 #include "base/eintr_wrapper.h"
 #include "base/shared_memory.h"
+#include "skia/ext/platform_canvas.h"
 
 TransportDIB::TransportDIB()
     : size_(0) {
 }
 
 TransportDIB::TransportDIB(TransportDIB::Handle dib)
     : shared_memory_(dib, false /* read write */),
       size_(0) {
 }
 
@@ skipping 23 matching lines @@
     delete dib;
     HANDLE_EINTR(close(handle.fd));
     return false;
   }
 
   dib->size_ = st.st_size;
 
   return dib;
 }
 
+skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
+  return new skia::PlatformCanvas(w, h, true,
+                                  reinterpret_cast<uint8_t*>(dib->memory()));
+}
+
 void* TransportDIB::memory() const {
   return shared_memory_.memory();
 }
 
 TransportDIB::Id TransportDIB::id() const {
   return shared_memory_.id();
 }
 
 TransportDIB::Handle TransportDIB::handle() const {
   return shared_memory_.handle();
 }