Mojo: Make Core own a PlatformSupport, and plumb it through to Channel.

mojo/system/core.cc

Index: mojo/system/core.cc
diff --git a/mojo/system/core.cc b/mojo/system/core.cc
index 47d63f66580b003ade24e4101d825e44444942b7..82cb1178d761f92d559352e620d4aeb22d9e36ce 100644
--- a/mojo/system/core.cc
+++ b/mojo/system/core.cc
@@ -9,6 +9,7 @@
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "mojo/embedder/platform_shared_buffer.h"
+#include "mojo/embedder/platform_support.h"
 #include "mojo/embedder/simple_platform_support.h"  // TODO(vtl): Remove this.
 #include "mojo/public/c/system/macros.h"
 #include "mojo/system/constants.h"
@@ -75,7 +76,8 @@ namespace system {
 //    - Locks at the "INF" level may not have any locks taken while they are
 //      held.
 
-Core::Core() {
+// TODO(vtl): This should take a |scoped_ptr<PlatformSupport>| as a parameter.
+Core::Core() : platform_support_(new embedder::SimplePlatformSupport()) {
 }
 
 Core::~Core() {
@@ -463,12 +465,9 @@ MojoResult Core::CreateSharedBuffer(
   if (result != MOJO_RESULT_OK)
     return result;
 
-  // TODO(vtl): |Core| should have a |PlatformSupport| passed in at creation
-  // time, and we should use that instead.
-  embedder::SimplePlatformSupport platform_support;
   scoped_refptr<SharedBufferDispatcher> dispatcher;
   result = SharedBufferDispatcher::Create(
-      &platform_support, validated_options, num_bytes, &dispatcher);
+      platform_support(), validated_options, num_bytes, &dispatcher);
   if (result != MOJO_RESULT_OK) {
     DCHECK(!dispatcher);
     return result;