Allow Skyframe graph lookups and value retrievals to throw InterruptedException.

The only place we now don't handle InterruptedException is in the action graph created after analysis, since I'm not sure that will be around for that much longer.

--
MOS_MIGRATED_REVID=130327770
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/TransitiveTraversalFunction.java b/src/main/java/com/google/devtools/build/lib/skyframe/TransitiveTraversalFunction.java
index 1852793..0a85af0 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/TransitiveTraversalFunction.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/TransitiveTraversalFunction.java
@@ -29,10 +29,8 @@
 import com.google.devtools.build.skyframe.SkyKey;
 import com.google.devtools.build.skyframe.SkyValue;
 import com.google.devtools.build.skyframe.ValueOrException2;
-
 import java.util.Collection;
 import java.util.Map.Entry;
-
 import javax.annotation.Nullable;
 
 /**
@@ -117,7 +115,7 @@
 
   @Override
   TargetMarkerValue getTargetMarkerValue(SkyKey targetMarkerKey, Environment env)
-      throws NoSuchTargetException, NoSuchPackageException {
+      throws NoSuchTargetException, NoSuchPackageException, InterruptedException {
     return TargetMarkerFunction.computeTargetMarkerValue(targetMarkerKey, env);
   }