[Cronet] Exclude unused classes from src jar

List of patterns of .class files to exclude from the cronet_impl_native_java.jar,
while they still exist in the cronet_impl_native_java-src.jar. This CL fixes their
consistency, and reduce the cronet_impl_native_java-src.jar by about 50 KiB.

TBR=xunjieli@chromium.org

Change-Id: Ieefd47e47b406873c941203d509e898371392ee9
Reviewed-on: https://chromium-review.googlesource.com/1102235Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567667}

components/cronet/android/BUILD.gn

@@ -946,15 +946,8 @@ action("extract_cronet_native_jars") {
   ]
 }
 
-action("repackage_extracted_native_jars") {
-  _output_jar = "$_package_dir/cronet_impl_native_java.jar"
-
-  script = "//build/android/gyp/jar.py"
-  outputs = [
-    _output_jar,
-  ]
-
-  jar_excluded_patterns = [
+# List of patterns of .class files to exclude from the jar.
+jar_excluded_patterns = [
   # Excludes Android support libraries crbug.com/832770.
   "android/*",
   "*/library_loader/*.class",
@@ -963,6 +956,14 @@ action("repackage_extracted_native_jars") {
   "*/SysUtils.class",
   "*/CachedMetrics*.class",
   "org/chromium/base/memory/MemoryPressureMonitor*.class",
+]
+
+action("repackage_extracted_native_jars") {
+  _output_jar = "$_package_dir/cronet_impl_native_java.jar"
+
+  script = "//build/android/gyp/jar.py"
+  outputs = [
+    _output_jar,
   ]
 
   args = [
@@ -1120,6 +1121,10 @@ template("jar_src") {
       deps += invoker.deps
     }
 
+    _excluded_patterns = []
+    if (defined(invoker.excluded_patterns)) {
+      _excluded_patterns = invoker.excluded_patterns
+    }
     _src_jars = []
 
     # Add src-jar files that are listed in "src_jars".
@@ -1157,6 +1162,7 @@ template("jar_src") {
     args += [ "--src-jar=${_src_jars}" ]
     args += [ "--src-files=${_src_files}" ]
     args += [ "--src-list-files=${_src_list_files}" ]
+    args += [ "--excluded-classes=$_excluded_patterns" ]
 
     inputs = _src_jars
     inputs += _src_files
@@ -1220,6 +1226,7 @@ jar_src("jar_cronet_impl_native_java_source") {
                   "//net/android:net_android_java_enums_srcjar",
                   "//net/android:net_errors_java",
                 ]
+  excluded_patterns = jar_excluded_patterns
   jar_path = "$_package_dir/cronet_impl_native_java-src.jar"
 }
 

components/cronet/tools/jar_src.py

@@ -43,6 +43,8 @@ def UnzipSourceJar(jar, unzipped_jar_path):
 def main():
   parser = optparse.OptionParser()
   build_utils.AddDepfileOption(parser)
+  parser.add_option('--excluded-classes',
+      help='A list of .class file patterns to exclude from the jar.')
   parser.add_option('--src-search-dirs', action="append",
       help='A list of directories that should be searched'
            ' for the source files.')
@@ -94,6 +96,15 @@ def main():
     if prefix_position != -1:
       src_files[i] = s[prefix_position:]
 
+  excluded_classes = []
+  if options.excluded_classes:
+    classes = build_utils.ParseGnList(options.excluded_classes)
+    excluded_classes.extend(f.replace('.class', '.java') for f in classes)
+
+  predicate = None
+  if excluded_classes:
+    predicate = lambda f: not build_utils.MatchesGlob(f, excluded_classes)
+
   # Create a dictionary that maps every source directory
   # to source files that it contains.
   dir_to_files_map = {}
@@ -106,6 +117,7 @@ def main():
     for src_search_dir in src_search_dirs:
       if os.path.isfile(os.path.join(src_search_dir, src_file)):
         number_of_file_instances += 1
+        if not predicate or predicate(src_file):
           dir_to_files_map[src_search_dir].append(src_file)
     if (number_of_file_instances > 1):
       raise Exception(