Introduce a Skyframe function: ActionEnvironmentFunction 

ActionEnvironmentFunction returns the list of environment
variable with the one overwritten by --action_env being
replaced. This let other Skyframe function declares
dependency to any value of the environment and being
influenced by the --action_env flag.

This will be used to declare dependency of remote repositories
on environment variables (step 3 of
https://bazel.build/designs/2016/10/18/repository-invalidation.html)

--
Change-Id: I1ed3fb6f48e8e17d4d64c903fccecb6ed7596350
Reviewed-on: https://cr.bazel.build/7974
PiperOrigin-RevId: 146918603
MOS_MIGRATED_REVID=146918603

src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java b/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
index bf49ba0..7527f88 100644
--- a/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
+++ b/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
@@ -498,6 +498,7 @@
           "",
           UUID.randomUUID(),
           ImmutableMap.<String, String>of(),
+          ImmutableMap.<String, String>of(),
           new TimestampGranularityMonitor(BlazeClock.instance()));
     }
 
@@ -584,6 +585,7 @@
           "",
           UUID.randomUUID(),
           ImmutableMap.<String, String>of(),
+          ImmutableMap.<String, String>of(),
           new TimestampGranularityMonitor(BlazeClock.instance()));
       skyframeExecutor.invalidateFilesUnderPathForTesting(
           new Reporter(), modifiedFileSet, workspace);

src/test/java/com/google/devtools/build/lib/pkgcache/LoadingPhaseRunnerTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/pkgcache/LoadingPhaseRunnerTest.java b/src/test/java/com/google/devtools/build/lib/pkgcache/LoadingPhaseRunnerTest.java
index 79e0976..bd06f06 100644
--- a/src/test/java/com/google/devtools/build/lib/pkgcache/LoadingPhaseRunnerTest.java
+++ b/src/test/java/com/google/devtools/build/lib/pkgcache/LoadingPhaseRunnerTest.java
@@ -627,6 +627,7 @@
           analysisMock.getDefaultsPackageContent(),
           UUID.randomUUID(),
           ImmutableMap.<String, String>of(),
+          ImmutableMap.<String, String>of(),
           new TimestampGranularityMonitor(clock));
       loadingPhaseRunner =
           skyframeExecutor.getLoadingPhaseRunner(pkgFactory.getRuleClassNames(), useNewImpl);

src/test/java/com/google/devtools/build/lib/pkgcache/PackageCacheTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/pkgcache/PackageCacheTest.java b/src/test/java/com/google/devtools/build/lib/pkgcache/PackageCacheTest.java
index a7a5918..3c6bbe4 100644
--- a/src/test/java/com/google/devtools/build/lib/pkgcache/PackageCacheTest.java
+++ b/src/test/java/com/google/devtools/build/lib/pkgcache/PackageCacheTest.java
@@ -113,6 +113,7 @@
         analysisMock.getDefaultsPackageContent(),
         UUID.randomUUID(),
         ImmutableMap.<String, String>of(),
+        ImmutableMap.<String, String>of(),
         new TimestampGranularityMonitor(BlazeClock.instance()));
     skyframeExecutor.setDeletedPackages(
         ImmutableSet.copyOf(packageCacheOptions.getDeletedPackages()));