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

chrome/common/transport_dib_linux.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 <errno.h>
 #include <stdlib.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
 
 #include "base/gfx/size.h"
 #include "base/logging.h"
 #include "chrome/common/transport_dib.h"
 #include "chrome/common/x11_util.h"
+#include "skia/ext/platform_canvas.h"
 
 // The shmat system call uses this as it's invalid return address
 static void *const kInvalidAddress = (void*) -1;
 
 TransportDIB::TransportDIB()
     : key_(-1),
       address_(kInvalidAddress),
       x_shm_(0),
       display_(NULL),
       size_(0) {
@@ skipping 49 matching lines @@
     return NULL;
 
   TransportDIB* dib = new TransportDIB;
 
   dib->address_ = address;
   dib->size_ = shmst.shm_segsz;
   dib->key_ = shmkey;
   return dib;
 }
 
+skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
+  return new skia::PlatformCanvas(w, h, true,
+                                  reinterpret_cast<uint8_t*>(memory()));
+}
+
 void* TransportDIB::memory() const {
   DCHECK_NE(address_, kInvalidAddress);
   return address_;
 }
 
 TransportDIB::Id TransportDIB::id() const {
   return key_;
 }
 
 TransportDIB::Handle TransportDIB::handle() const {
   return key_;
 }
 
 XID TransportDIB::MapToX(Display* display) {
   if (!x_shm_) {
     x_shm_ = x11_util::AttachSharedMemory(display, key_);
     display_ = display;
   }
 
   return x_shm_;
 }