Adds sync brokering to Windows EDK

content/shell/utility/shell_content_utility_client.cc

Index: content/shell/utility/shell_content_utility_client.cc
diff --git a/content/shell/utility/shell_content_utility_client.cc b/content/shell/utility/shell_content_utility_client.cc
index daec25c93759c18856fe302ea496afd878f8be18..5eb2dadfc436bade33b820351fc35dc816f1f54b 100644
--- a/content/shell/utility/shell_content_utility_client.cc
+++ b/content/shell/utility/shell_content_utility_client.cc
@@ -13,6 +13,7 @@
 #include "content/public/test/test_mojo_app.h"
 #include "content/public/test/test_mojo_service.mojom.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/public/cpp/system/buffer.h"
 #include "services/shell/public/cpp/interface_registry.h"
 
 namespace content {
@@ -45,6 +46,20 @@ class TestMojoServiceImpl : public mojom::TestMojoService {
     NOTREACHED();
   }
 
+  void CreateSharedBuffer(const std::string& message,
+                          const CreateSharedBufferCallback& callback) override {
+    mojo::ScopedSharedBufferHandle buffer =
+        mojo::SharedBufferHandle::Create(message.size());
+    CHECK(buffer.is_valid());
+
+    mojo::ScopedSharedBufferMapping mapping = buffer->Map(message.size());
+    CHECK(mapping);
+    std::copy(message.begin(), message.end(),
+              reinterpret_cast<char*>(mapping.get()));
+
+    callback.Run(std::move(buffer));
+  }
+
  private:
   explicit TestMojoServiceImpl() {}