Add //mojo/edk/platform and move platform_task_runners.h there.

mojo/edk/platform/task_runner.h

Index: mojo/edk/platform/task_runner.h
diff --git a/mojo/edk/embedder/platform_task_runner.h b/mojo/edk/platform/task_runner.h
similarity index 74%
rename from mojo/edk/embedder/platform_task_runner.h
rename to mojo/edk/platform/task_runner.h
index 1561c6b023b699211cf25e34c09c9168ef51cbf4..e54213f34bd5da7178cbae6b881771d3b09b6348 100644
--- a/mojo/edk/embedder/platform_task_runner.h
+++ b/mojo/edk/platform/task_runner.h
@@ -5,23 +5,22 @@
 // This file provides an interface for "task runners", which are used within the
 // EDK itself.
 
-#ifndef MOJO_EDK_EMBEDDER_PLATFORM_TASK_RUNNER_H_
-#define MOJO_EDK_EMBEDDER_PLATFORM_TASK_RUNNER_H_
+#ifndef MOJO_EDK_PLATFORM_TASK_RUNNER_H_
+#define MOJO_EDK_PLATFORM_TASK_RUNNER_H_
 
 #include "base/callback_forward.h"
 #include "mojo/edk/util/ref_counted.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace embedder {
+namespace platform {
 
 // Interface for "task runners", which can be used to schedule tasks to be run
 // asynchronously (possibly on a different thread). Implementations must be
 // thread-safe.
-class PlatformTaskRunner
-    : public util::RefCountedThreadSafe<PlatformTaskRunner> {
+class TaskRunner : public util::RefCountedThreadSafe<TaskRunner> {
  public:
-  virtual ~PlatformTaskRunner() {}
+  virtual ~TaskRunner() {}
 
   // Posts a task to this task runner (i.e., schedule the task). The task must
   // be run (insofar as this can be guaranteed). (This must not run the task
@@ -35,13 +34,13 @@ class PlatformTaskRunner
   virtual bool RunsTasksOnCurrentThread() const = 0;
 
  protected:
-  PlatformTaskRunner() {}
+  TaskRunner() {}
 
  private:
-  MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformTaskRunner);
+  MOJO_DISALLOW_COPY_AND_ASSIGN(TaskRunner);
 };
 
-}  // namespace embedder
+}  // namespace platform
 }  // namespace mojo
 
-#endif  // MOJO_EDK_EMBEDDER_PLATFORM_TASK_RUNNER_H_
+#endif  // MOJO_EDK_PLATFORM_TASK_RUNNER_H_