Android: Modify package resources post processing.

This CL adds support for extra post processing after package_resources
is complete, including modifying the R.java files that are used.

Bug: 762130
Change-Id: I25fdc9a4bd9f2a13620036cb6988dced8d2602ea
Reviewed-on: https://chromium-review.googlesource.com/761676
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522335}

build/config/android/internal_rules.gni

@@ -1389,6 +1389,9 @@ if (enable_java_templates) {
   # Runs process_resources.py
   template("process_resources") {
     _process_resources_target_name = target_name
+    if (defined(invoker.srcjar_path)) {
+      _srcjar_path = invoker.srcjar_path
+    }
     if (defined(invoker.output)) {
       _post_process = defined(invoker.post_process_script)
       _packaged_resources_path = invoker.output
@@ -1398,6 +1401,11 @@ if (enable_java_templates) {
             get_path_info(_packaged_resources_path, "dir") + "/" +
             get_path_info(_packaged_resources_path, "name") +
             ".intermediate.ap_"
+
+        # TODO(estevenson): Remove this check.
+        if (defined(invoker.post_process_args)) {
+          _srcjar_path = "${_srcjar_path}.intermediate.srcjar"
+        }
       }
     }
     action(_process_resources_target_name) {
@@ -1514,11 +1522,11 @@ if (enable_java_templates) {
         ]
       }
 
-      if (defined(invoker.srcjar_path)) {
-        outputs += [ invoker.srcjar_path ]
+      if (defined(_srcjar_path)) {
+        outputs += [ _srcjar_path ]
         args += [
           "--srcjar-out",
-          rebase_path(invoker.srcjar_path, root_build_dir),
+          rebase_path(_srcjar_path, root_build_dir),
         ]
       }
 
@@ -1633,6 +1641,19 @@ if (enable_java_templates) {
         public_deps = [
           ":${_process_resources_target_name}",
         ]
+
+        # TODO(estevenson): Remove this check.
+        if (defined(invoker.post_process_args)) {
+          args += [
+                    "--srcjar-in",
+                    rebase_path(_srcjar_path, root_build_dir),
+                    "--srcjar-out",
+                    rebase_path(invoker.srcjar_path, root_build_dir),
+                  ] + invoker.post_process_args
+          inputs += [ _srcjar_path ]
+          outputs += [ invoker.srcjar_path ]
+          public_deps += invoker.post_process_deps
+        }
       }
     }
   }

build/config/android/rules.gni

@@ -2048,6 +2048,12 @@ if (enable_java_templates) {
       version_name = _version_name
       if (defined(invoker.post_process_package_resources_script)) {
         post_process_script = invoker.post_process_package_resources_script
+
+        # TODO(estevenson): Remove this check.
+        if (defined(invoker.post_process_package_resources_deps)) {
+          post_process_deps = invoker.post_process_package_resources_deps
+          post_process_args = invoker.post_process_package_resources_args
+        }
       }
       srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
       r_text_out_path = "${target_gen_dir}/${target_name}_R.txt"