Add src_files to src_jar GN template

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index a26be55dd92487a88efd937f6e8ab16c6e8ebbc8..80945ee3c036cba92fba643aec69b933555870ad 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -2253,6 +2253,7 @@ if (is_android) {
     srcjar_deps = [
       ":base_android_java_enums_srcjar",
       ":base_build_config_gen",
+      ":base_java_srcjar",

[agrieve, 2016/09/20 00:09:41]

Putting these files into a srcjar will make them uneditable in Android Studio
(https://chromium.googlesource.com/chromium/src.git/+/master/docs/android_stud...)

I think it's also the case that you don't really need these to be zipped, you
just need the list of sources. If this is true, I'd recommend using the .sources
file that's written as a part of gn gen here:
https://cs.chromium.org/chromium/src/build/config/android/internal_rules.gni?...

[kapishnikov, 2016/09/20 14:59:31]

That is a very good point. Thanks for the idea of using ".sources" file. I will
change it.

       ":base_native_libraries_gen",
     ]
 
@@ -2262,7 +2263,18 @@ if (is_android) {
       "//third_party/jsr-305:jsr_305_javalib",
     ]
 
-    java_files = [
+    # New versions of BuildConfig.java and NativeLibraries.java
+    # (with the actual correct values) will be created when creating an apk.
+    jar_excluded_patterns = [
+      "*/BuildConfig.class",
+      "*/NativeLibraries.class",
+      "*/NativeLibraries##*.class",
+    ]
+  }
+
+  # Creates srcjar that contains sources for "base_java".
+  zip("base_java_srcjar") {
+    inputs = [
       "android/java/src/org/chromium/base/ActivityState.java",
       "android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java",
       "android/java/src/org/chromium/base/ApiCompatibilityUtils.java",
@@ -2326,14 +2338,8 @@ if (is_android) {
       "android/java/src/org/chromium/base/metrics/RecordUserAction.java",
       "android/java/src/org/chromium/base/multidex/ChromiumMultiDexInstaller.java",
     ]
-
-    # New versions of BuildConfig.java and NativeLibraries.java
-    # (with the actual correct values) will be created when creating an apk.
-    jar_excluded_patterns = [
-      "*/BuildConfig.class",
-      "*/NativeLibraries.class",
-      "*/NativeLibraries##*.class",
-    ]
+    output = "$target_gen_dir/$target_name.srcjar"
+    base_dir = rebase_path("//base/android/java/src")
   }
 
   # GYP: //base.gyp:base_javatests