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

chrome/common/transport_dib_mac.cc

Index: chrome/common/transport_dib_mac.cc
diff --git a/chrome/common/transport_dib_mac.cc b/chrome/common/transport_dib_mac.cc
old mode 100644
new mode 100755
index b4c7a2a7168ed6f32f6d59352268bb0db121270e..638866ca570017d2e25cbc6c886e3af09f4a245d
--- a/chrome/common/transport_dib_mac.cc
+++ b/chrome/common/transport_dib_mac.cc
@@ -9,6 +9,7 @@
 
 #include "base/eintr_wrapper.h"
 #include "base/shared_memory.h"
+#include "skia/ext/platform_canvas.h"
 
 TransportDIB::TransportDIB()
     : size_(0) {
@@ -52,6 +53,11 @@ TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) {
   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();
 }