Add cc::SharedBitmap::shared_memory_handle()

cc/resources/shared_bitmap.cc

Index: cc/resources/shared_bitmap.cc
diff --git a/cc/resources/shared_bitmap.cc b/cc/resources/shared_bitmap.cc
index 2eb128af661f4d1e2f3fccc3a3e7368fed16cbea..e5d84ed5adcb68c44fee001736a6080bf2431141 100644
--- a/cc/resources/shared_bitmap.cc
+++ b/cc/resources/shared_bitmap.cc
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include "base/logging.h"
+#include "base/memory/shared_memory_handle.h"
 #include "base/numerics/safe_math.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
@@ -21,6 +22,10 @@ SharedBitmap::SharedBitmap(uint8_t* pixels, const SharedBitmapId& id)
 SharedBitmap::~SharedBitmap() {
 }
 
+base::SharedMemoryHandle SharedBitmap::shared_memory_handle() const {
+  return base::SharedMemoryHandle();
+}
+
 // static
 bool SharedBitmap::SizeInBytes(const gfx::Size& size, size_t* size_in_bytes) {
   if (size.IsEmpty())