Add self tests for gyp_to_android.

platform_tools/android/bin/android_framework_gyp.py

Index: platform_tools/android/bin/android_framework_gyp.py
diff --git a/platform_tools/android/bin/android_framework_gyp.py b/platform_tools/android/bin/android_framework_gyp.py
index 4088b506c886c351cd31ad4c340059df162167d4..9ce65aec3b74408c0b8211109cd6a6012c3eb2c4 100644
--- a/platform_tools/android/bin/android_framework_gyp.py
+++ b/platform_tools/android/bin/android_framework_gyp.py
@@ -12,29 +12,35 @@ Modified version of gyp_skia, used by gyp_to_android.py to generate Android.mk
 import os
 import sys
 
-script_dir = os.path.dirname(__file__)
+SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
 
 # Unlike gyp_skia, this file is nested deep inside Skia. Find Skia's trunk dir.
 # This line depends on the fact that the script is three levels deep
 # (specifically, it is in platform_tools/android/bin).
-skia_dir = os.path.normpath(os.path.join(script_dir, os.pardir, os.pardir,
+SKIA_DIR = os.path.normpath(os.path.join(SCRIPT_DIR, os.pardir, os.pardir,
                                          os.pardir))
-dir_contents = os.listdir(skia_dir)
+dir_contents = os.listdir(SKIA_DIR)
 assert 'third_party' in dir_contents and 'gyp' in dir_contents
 
 # Directory within which we can find the gyp source.
-gyp_source_dir = os.path.join(skia_dir, 'third_party', 'externals', 'gyp')
-
-# Directory within which we can find most of Skia's gyp configuration files.
-gyp_config_dir = os.path.join(skia_dir, 'gyp')
+GYP_SOURCE_DIR = os.path.join(SKIA_DIR, 'third_party', 'externals', 'gyp')
 
 # Ensure we import our current gyp source's module, not any version
 # pre-installed in your PYTHONPATH.
-sys.path.insert(0, os.path.join(gyp_source_dir, 'pylib'))
+sys.path.insert(0, os.path.join(GYP_SOURCE_DIR, 'pylib'))
 
 import gyp
 
-def main(skia_arch_type, have_neon):
+def main(target_dir, target_file, skia_arch_type, have_neon):
+  """
+  Create gypd files based on target_file.
+  @param target_dir Directory containing all gyp files, including common.gypi
+  @param target_file Gyp file to start on. Other files within target_dir will
+                     be read if target_file depends on them.
+  @param skia_arch_type Target architecture to pass to gyp.
+  @param have_neon Whether to generate files including neon optimizations.
+                   Only meaningful if skia_arch_type is 'arm'.
+  """
   # Set GYP_DEFINES for building for the android framework.
   gyp_defines = ('skia_android_framework=1 OS=android skia_arch_type=%s '
                  % skia_arch_type)
@@ -50,10 +56,9 @@ def main(skia_arch_type, have_neon):
 
   args = []
   args.extend(['--depth', '.'])
-  # Use the android_framework_lib file instead of skia.gyp
-  args.extend([os.path.join(gyp_config_dir, 'android_framework_lib.gyp')])
+  args.extend([os.path.join(target_dir, target_file)])
   # Common conditions
-  args.extend(['-I', 'gyp/common.gypi'])
+  args.extend(['-I', os.path.join(target_dir, 'common.gypi')])
   # Use the debugging format. We'll use these to create one master make file.
   args.extend(['-f', 'gypd'])