Decouple input_method from BrowserThread (and content/).

chrome/browser/chromeos/input_method/input_method_delegate.h

Index: chrome/browser/chromeos/input_method/input_method_delegate.h
diff --git a/chrome/browser/chromeos/input_method/input_method_delegate.h b/chrome/browser/chromeos/input_method/input_method_delegate.h
index ed0717313ea5407eeae75648a57534c51d65734d..174fb6392a516448b6d250aff0c2c49a163c69c5 100644
--- a/chrome/browser/chromeos/input_method/input_method_delegate.h
+++ b/chrome/browser/chromeos/input_method/input_method_delegate.h
@@ -8,6 +8,11 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+
+namespace base {
+class SequencedTaskRunner;
+}  // namespace base
 
 namespace chromeos {
 namespace input_method {
@@ -23,6 +28,14 @@ class InputMethodDelegate {
   virtual std::string GetHardwareKeyboardLayout() const = 0;
   // Retrieves the currently active UI locale.
   virtual std::string GetActiveLocale() const = 0;
+  // Retrieves the default task runner. The public input_method API should only
+  // be accessed in the context of this task runner.
+  virtual scoped_refptr<base::SequencedTaskRunner>
+      GetDefaultTaskRunner() const = 0;
+  // Retrieves a task runner that may be used for possibly blocking tasks such
+  // as file IO.
+  virtual scoped_refptr<base::SequencedTaskRunner>
+      GetWorkerTaskRunner() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputMethodDelegate);