Add depfile support to android build scripts

build/config/android/rules.gni

Index: build/config/android/rules.gni
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
index d63c7bf94a5a7c0076bc0a0619ee26e793b2ecea..5b313ac10fb30c42b04c889a8e9a978fb65a3925 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -36,13 +36,16 @@ template("generate_jni") {
   foreach_target_name = "${target_name}__jni_gen"
   action_foreach(foreach_target_name) {
     script = "//base/android/jni_generator/jni_generator.py"
+    depfile = "$target_gen_dir/$target_name.{{source_name_part}}.d"
     sources = invoker.sources
     source_prereqs = [ jni_generator_include ]
     outputs = [
+      depfile,
       "${jni_output_dir}/{{source_name_part}}_jni.h"
     ]
 
     args = [
+      "--depfile", rebase_path(depfile, root_build_dir),
       "--input_file={{source}}",
       "--optimize_generation=1",
       "--ptr_type=long",
@@ -123,16 +126,19 @@ template("generate_jar_jni") {
     jni_target_name = "${target_name}__jni_${classname}"
     jni_actions += [ ":$jni_target_name" ]
     action(jni_target_name) {
+      depfile = "$target_gen_dir/$target_name.d"
       script = "//base/android/jni_generator/jni_generator.py"
       sources = [
         jni_generator_include,
         jar_file,
       ]
       outputs = [
+        depfile,
         "${jni_output_dir}/${classname}_jni.h"
       ]
 
       args = [
+        "--depfile", rebase_path(depfile, root_build_dir),
         "--jar_file", rebase_path(jar_file, root_build_dir),
         "--input_file", class,
         "--optimize_generation=1",
@@ -205,6 +211,7 @@ template("java_cpp_template") {
     if (defined(invoker.source_prereqs)) {
       source_prereqs = invoker.source_prereqs + []
     }
+    depfile = "${target_gen_dir}/${target_name}.d"
 
     sources = invoker.sources
 
@@ -212,10 +219,12 @@ template("java_cpp_template") {
     gcc_template_output_pattern = "${gen_dir}/{{source_name_part}}.java"
 
     outputs = [
+      depfile,
       gcc_template_output_pattern
     ]
 
     args = [
+      "--depfile", rebase_path(depfile, root_build_dir),
       "--include-path", rebase_path(include_path, root_build_dir),
       "--output", rebase_path(gen_dir, root_build_dir) + "/{{source_name_part}}.java",
       "--template={{source}}",