Add input content checking to some build scripts

build/java.gypi

Index: build/java.gypi
diff --git a/build/java.gypi b/build/java.gypi
index b93a2466006c29585cdb25b12ac52bfc3376b480..68725f58c79bb20de200e3c521f9b672919a8769 100644
--- a/build/java.gypi
+++ b/build/java.gypi
@@ -187,7 +187,7 @@
       },
       'inputs': [
         '<(DEPTH)/build/android/pylib/build_utils.py',
-        '<(DEPTH)/build/android/javac.py',
+        '<(DEPTH)/build/android/gyp/javac.py',
         '>!@(find >(java_in_dir) >(additional_src_dirs) -name "*.java")',
         '>@(input_jars_paths)',
         '>@(additional_input_paths)',
@@ -196,7 +196,7 @@
         '<(compile_stamp)',
       ],
       'action': [
-        'python', '<(DEPTH)/build/android/javac.py',
+        'python', '<(DEPTH)/build/android/gyp/javac.py',
         '--output-dir=<(classes_dir)',
         '--classpath=>(input_jars_paths)',
         '--src-dirs=>(all_src_dirs)',
@@ -213,14 +213,15 @@
       'message': 'Creating <(_target_name) jar',
       'inputs': [
         '<(DEPTH)/build/android/pylib/build_utils.py',
-        '<(DEPTH)/build/android/jar.py',
+        '<(DEPTH)/build/android/gyp/util/md5_check.py',
+        '<(DEPTH)/build/android/gyp/jar.py',
         '<(compile_stamp)',
       ],
       'outputs': [
         '<(jar_path)',
       ],
       'action': [
-        'python', '<(DEPTH)/build/android/jar.py',
+        'python', '<(DEPTH)/build/android/gyp/jar.py',
         '--classes-dir=<(classes_dir)',
         '--jar-path=<(jar_path)',
         '--excluded-classes=<(jar_excluded_classes)',
@@ -234,14 +235,15 @@
       'message': 'Dexing <(_target_name) jar',
       'inputs': [
         '<(DEPTH)/build/android/pylib/build_utils.py',
-        '<(DEPTH)/build/android/dex.py',
+        '<(DEPTH)/build/android/gyp/util/md5_check.py',
+        '<(DEPTH)/build/android/gyp/dex.py',
         '<(jar_path)',
       ],
       'outputs': [
         '<(dex_path)',
       ],
       'action': [
-        'python', '<(DEPTH)/build/android/dex.py',
+        'python', '<(DEPTH)/build/android/gyp/dex.py',
         '--dex-path=<(dex_path)',
         '--android-sdk-root=<(android_sdk_root)',