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

chrome/common/transport_dib.h

Index: chrome/common/transport_dib.h
diff --git a/chrome/common/transport_dib.h b/chrome/common/transport_dib.h
old mode 100644
new mode 100755
index 33c0649aa96b55110b8f6e6b024fe689f7c05033..5712827fee66aa98c4c8a7357df47d93ba0e9d63
--- a/chrome/common/transport_dib.h
+++ b/chrome/common/transport_dib.h
@@ -20,6 +20,9 @@
 namespace gfx {
 class Size;
 }
+namespace skia {
+class PlatformCanvas;
+}
 
 // -----------------------------------------------------------------------------
 // A TransportDIB is a block of memory that is used to transport pixels
@@ -84,6 +87,11 @@ class TransportDIB {
   // Map the referenced transport DIB. Returns NULL on failure.
   static TransportDIB* Map(Handle transport_dib);
 
+  // Returns a canvas using the memory of this TransportDIB. The returned
+  // pointer will be owned by the caller. The bitmap will be of the given size,
+  // which should fit inside this memory.
+  skia::PlatformCanvas* GetPlatformCanvas(int w, int h);
+
   // Return a pointer to the shared memory
   void* memory() const;