Make SharedMemoryHandle a class on windows.

ui/surface/transport_dib_win.cc

Index: ui/surface/transport_dib_win.cc
diff --git a/ui/surface/transport_dib_win.cc b/ui/surface/transport_dib_win.cc
index e8d36adbd5a5454c36e64bb46ac18b5bbbe6d762..af55af284349ca9648a9088d4c14f3024efc0dae 100644
--- a/ui/surface/transport_dib_win.cc
+++ b/ui/surface/transport_dib_win.cc
@@ -20,10 +20,8 @@ TransportDIB::TransportDIB()
 TransportDIB::~TransportDIB() {
 }
 
-TransportDIB::TransportDIB(HANDLE handle)
-    : shared_memory_(handle, false /* read write */),
-      size_(0) {
-}
+TransportDIB::TransportDIB(base::SharedMemoryHandle handle)
+    : shared_memory_(handle, false /* read write */), size_(0) {}
 
 // static
 TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) {
@@ -55,7 +53,7 @@ TransportDIB* TransportDIB::CreateWithHandle(Handle handle) {
 
 // static
 bool TransportDIB::is_valid_handle(Handle dib) {
-  return dib != NULL;
+  return dib.IsValid();
 }
 
 skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
@@ -66,9 +64,9 @@ skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
   // We can't check the canvas size before mapping, but it's safe because
   // Windows will fail to map the section if the dimensions of the canvas
   // are too large.
-  skia::PlatformCanvas* canvas =
-      skia::CreatePlatformCanvas(w, h, true, shared_memory_.handle(),
-                                 skia::RETURN_NULL_ON_FAILURE);
+  skia::PlatformCanvas* canvas = skia::CreatePlatformCanvas(
+      w, h, true, shared_memory_.handle().GetHandle(),
+      skia::RETURN_NULL_ON_FAILURE);
 
   // Calculate the size for the memory region backing the canvas.
   if (canvas)
@@ -85,7 +83,7 @@ bool TransportDIB::Map() {
 
   if (!shared_memory_.Map(0 /* map whole shared memory segment */)) {
     LOG(ERROR) << "Failed to map transport DIB"
-               << " handle:" << shared_memory_.handle()
+               << " handle:" << shared_memory_.handle().GetHandle()
                << " error:" << ::GetLastError();
     return false;
   }