Add mojom structs for base::Time, base::TimeDelta and base::TimeTicks.

mojo/common/test_common_custom_types.mojom

Index: mojo/common/test_common_custom_types.mojom
diff --git a/mojo/common/test_common_custom_types.mojom b/mojo/common/test_common_custom_types.mojom
index 314f131a12e8bf8786c99533022a248c1c9c165d..db91a4f53f45727b51b527c0b7d0c86fa1d574e3 100644
--- a/mojo/common/test_common_custom_types.mojom
+++ b/mojo/common/test_common_custom_types.mojom
@@ -11,6 +11,14 @@ interface TestFilePath {
       => (mojo.common.mojom.FilePath out);
 };
 
+interface TestTime {
+  BounceTime(mojo.common.mojom.Time time) => (mojo.common.mojom.Time time);
+  BounceTimeDelta(mojo.common.mojom.TimeDelta time_delta)
+      => (mojo.common.mojom.TimeDelta time_delta);
+  BounceTimeTicks(mojo.common.mojom.TimeTicks time_ticks)
+      => (mojo.common.mojom.TimeTicks time_ticks);
+};
+
 interface TestValue {
   BounceDictionaryValue(mojo.common.mojom.DictionaryValue in)
       => (mojo.common.mojom.DictionaryValue out);