Reland of GN: Enable proguard for apks

build/android/gyp/util/proguard_util.py

Index: build/android/gyp/util/proguard_util.py
diff --git a/build/android/gyp/util/proguard_util.py b/build/android/gyp/util/proguard_util.py
index 901cd9f2a8f30c5491986492cc3a4575776ef8a2..8ca86462631939eb0f44eb2b506b8e508e5fe762 100644
--- a/build/android/gyp/util/proguard_util.py
+++ b/build/android/gyp/util/proguard_util.py
@@ -32,45 +32,55 @@ class ProguardCmdBuilder(object):
   def __init__(self, proguard_jar):
     assert os.path.exists(proguard_jar)
     self._proguard_jar_path = proguard_jar
-    self._test = None
+    self._tested_apk_info_path = None
+    self._tested_apk_info = None
     self._mapping = None
     self._libraries = None
     self._injars = None
     self._configs = None
     self._outjar = None
+    self._cmd = None
 
   def outjar(self, path):
+    assert self._cmd is None
     assert self._outjar is None
     self._outjar = path
 
-  def is_test(self, enable):
-    assert self._test is None
-    self._test = enable
+  def tested_apk_info(self, tested_apk_info_path):
+    assert self._cmd is None
+    assert self._tested_apk_info is None
+    self._tested_apk_info_path = tested_apk_info_path
 
   def mapping(self, path):
+    assert self._cmd is None
     assert self._mapping is None
     assert os.path.exists(path), path
     self._mapping = path
 
   def libraryjars(self, paths):
+    assert self._cmd is None
     assert self._libraries is None
     for p in paths:
       assert os.path.exists(p), p
     self._libraries = paths
 
   def injars(self, paths):
+    assert self._cmd is None
     assert self._injars is None
     for p in paths:
       assert os.path.exists(p), p
     self._injars = paths
 
   def configs(self, paths):
+    assert self._cmd is None
     assert self._configs is None
     for p in paths:
       assert os.path.exists(p), p
     self._configs = paths
 
   def build(self):
+    if self._cmd:
+      return self._cmd
     assert self._injars is not None
     assert self._outjar is not None
     assert self._configs is not None
@@ -78,7 +88,16 @@ class ProguardCmdBuilder(object):
       'java', '-jar', self._proguard_jar_path,
       '-forceprocessing',
     ]
-    if self._test:
+    if self._tested_apk_info_path:
+      assert len(self._configs) == 1
+      tested_apk_info = build_utils.ReadJson(self._tested_apk_info_path)
+      self._configs += tested_apk_info['configs']
+      self._injars = [
+          p for p in self._injars if not p in tested_apk_info['inputs']]
+      if not self._libraries:
+        self._libraries = []
+      self._libraries += tested_apk_info['inputs']
+      self._mapping = tested_apk_info['mapping']
       cmd += [
         '-dontobfuscate',
         '-dontoptimize',
@@ -111,18 +130,38 @@ class ProguardCmdBuilder(object):
       '-printusage', self._outjar + '.usage',
       '-printmapping', self._outjar + '.mapping',
     ]
-    return cmd
+    self._cmd = cmd
+    return self._cmd
 
   def GetInputs(self):
+    self.build()
     inputs = [self._proguard_jar_path] + self._configs + self._injars
     if self._mapping:
       inputs.append(self._mapping)
     if self._libraries:
       inputs += self._libraries
+    if self._tested_apk_info_path:
+      inputs += [self._tested_apk_info_path]
     return inputs
 
 
   def CheckOutput(self):
-    build_utils.CheckOutput(self.build(), print_stdout=True,
+    self.build()
+    # Proguard will skip writing these files if they would be empty. Create
+    # empty versions of them all now so that they are updated as the build
+    # expects.
+    open(self._outjar + '.dump', 'w').close()
+    open(self._outjar + '.seeds', 'w').close()
+    open(self._outjar + '.usage', 'w').close()
+    open(self._outjar + '.mapping', 'w').close()
+    build_utils.CheckOutput(self._cmd, print_stdout=True,
                             stdout_filter=FilterProguardOutput)
 
+    this_info = {
+      'inputs': self._injars,
+      'configs': self._configs,
+      'mapping': self._outjar + '.mapping',
+    }
+
+    build_utils.WriteJson(this_info, self._outjar + '.info')
+