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/BuildConfigurationFunction.java b/src/main/java/com/google/devtools/build/lib/skyframe/BuildConfigurationFunction.java
index a25c3ac..3f18f85 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/BuildConfigurationFunction.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/BuildConfigurationFunction.java
@@ -29,7 +29,6 @@
 import com.google.devtools.build.skyframe.SkyKey;
 import com.google.devtools.build.skyframe.SkyValue;
 import com.google.devtools.build.skyframe.ValueOrException;
-
 import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;
@@ -52,7 +51,8 @@
   }
 
   @Override
-  public SkyValue compute(SkyKey skyKey, Environment env) throws SkyFunctionException {
+  public SkyValue compute(SkyKey skyKey, Environment env)
+      throws InterruptedException, BuildConfigurationFunctionException {
     BuildConfigurationValue.Key key = (BuildConfigurationValue.Key) skyKey.argument();
     Set<Fragment> fragments;
     try {
@@ -83,7 +83,7 @@
   }
 
   private Set<Fragment> getConfigurationFragments(BuildConfigurationValue.Key key, Environment env)
-      throws InvalidConfigurationException {
+      throws InvalidConfigurationException, InterruptedException {
 
     // Get SkyKeys for the fragments we need to load.
     Set<SkyKey> fragmentKeys = new LinkedHashSet<>();