Add source for Javac

Those source jars comes from
  javac.jar = https://github.com/google/error-prone-javac/archive/1.9.0-dev-r2644-2.zip
  javac7.jar = https://github.com/google/error-prone-javac/archive/1.9.0-dev-r2973-2.zip

As a consequence also updated the version in third_party readme.

Change-Id: I4c9d749d2b4acb1254cd65efbabf4e6515924414

third_party/README.md

diff --git a/third_party/README.md b/third_party/README.md
index 92b3a36..9f50de2 100644
--- a/third_party/README.md
+++ b/third_party/README.md
@@ -172,10 +172,9 @@
 
 ## [javac](https://github.com/google/error-prone-javac)
 
-* Version: 1.9.0-dev-r2973-2
+* Version: 1.9.0-dev-r2973-2 (javac7.jar) and 1.9.0-dev-r2644-2 (javac.jar)
 * License: GNU GPL v2 with Classpath exception
 
-
 ## [jarjar](https://code.google.com/p/jarjar/)
 
 * Version: 1.4

third_party/java/jdk/langtools/BUILD

diff --git a/third_party/java/jdk/langtools/BUILD b/third_party/java/jdk/langtools/BUILD
index e87fa27..d82080e 100644
--- a/third_party/java/jdk/langtools/BUILD
+++ b/third_party/java/jdk/langtools/BUILD
@@ -8,10 +8,12 @@
         "//tools/jdk:jdk7": [
             "BUILD",
             "javac7.jar",
+            "javac7.srcjar",
         ],
         "//conditions:default": [
             "BUILD",
             "javac.jar",
+            "javac.srcjar",
         ],
     }),
 )

third_party/java/jdk/langtools/javac.srcjar

diff --git a/third_party/java/jdk/langtools/javac.srcjar b/third_party/java/jdk/langtools/javac.srcjar
new file mode 100644
index 0000000..cab9de7
--- /dev/null
+++ b/third_party/java/jdk/langtools/javac.srcjar
Binary files differ

third_party/java/jdk/langtools/javac7.srcjar

diff --git a/third_party/java/jdk/langtools/javac7.srcjar b/third_party/java/jdk/langtools/javac7.srcjar
new file mode 100644
index 0000000..8fdd335
--- /dev/null
+++ b/third_party/java/jdk/langtools/javac7.srcjar
Binary files differ