GN: make relocation packing work

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 76fda46bce3b2bfd517c63dbd0aff5dafa8e91d0..2db732acd73d9a99c40ac406266a22ce14444fac 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -6,10 +6,10 @@ import("//base/android/linker/config.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//tools/grit/grit_rule.gni")
+import("//tools/relocation_packer/config.gni")
 
 assert(is_android)
 
-
 # Declare a jni target
 #
 # This target generates the native jni bindings for a set of .java files.
@@ -958,9 +958,6 @@ template("android_apk") {
   }
 
   _load_library_from_apk = false
-  if (defined(invoker.load_library_from_apk)) {
-    _load_library_from_apk = invoker.load_library_from_apk
-  }
 
   if (defined(invoker.native_libs)) {
     _use_chromium_linker = false
@@ -969,6 +966,21 @@ template("android_apk") {
         chromium_linker_supported)
     }
 
+    if (defined(invoker.load_library_from_apk) &&
+        invoker.load_library_from_apk) {
+      _load_library_from_apk = true
+      assert(_use_chromium_linker, "Loading library from the apk requires use" +
+          " of the Chromium linker.")
+    }
+
+    _enable_relocation_packing = false
+    if (defined(invoker.enable_relocation_packing) &&
+        invoker.enable_relocation_packing) {
+      _enable_relocation_packing = relocation_packing_supported
+      assert(_use_chromium_linker, "Relocation packing requires use of the" +
+          " Chromium linker.")
+    }
+
     _native_libs = invoker.native_libs
     _native_libs_dir = base_path + "/libs"
 
@@ -1090,19 +1102,48 @@ template("android_apk") {
   }
 
   if (_native_libs != []) {
-    copy_ex("${_template_name}__prepare_native") {
-      clear_dir = true
+    action("${_template_name}__prepare_native") {
+      script = "//build/android/gyp/pack_arm_relocations.py"
+      packed_libraries_dir = "$_native_libs_dir/$android_app_abi"
+      depfile = "$target_gen_dir/$target_name.d"
+      outputs = [
+        depfile
+      ]
       inputs = [
         build_config
       ]
-      dest = "$_native_libs_dir/$android_app_abi"
+      deps = []
+      skip_packing_list = [
+        "gdbserver",
+        "libchromium_android_linker.so",
+      ]
+
+      enable_packing_arg = 0
+      if (_enable_relocation_packing) {
+        enable_packing_arg = 1
+        deps += [
+          relocation_packer_target
+        ]
+      }
+
       args = [
-        "--files=@FileArg(${_rebased_build_config}:native:libraries)",
+        "--depfile", rebase_path(depfile, root_build_dir),
+        "--enable-packing=$enable_packing_arg",
+        "--has-relocations-with-addends=$relocations_have_addends",
+        "--exclude-packing-list=$skip_packing_list",
+        "--android-pack-relocations", rebase_path(relocation_packer_exe, root_build_dir),
+        "--android-objcopy", rebase_path(android_objcopy, root_build_dir),
+        "--stripped-libraries-dir", rebase_path(root_build_dir, root_build_dir),
+        "--packed-libraries-dir", rebase_path(packed_libraries_dir, root_build_dir),
+        "--libraries=@FileArg(${_rebased_build_config}:native:libraries)",
+        "--clear-dir"
       ]
+
       if (is_debug) {
-        rebased_gdbserver = rebase_path(android_gdbserver, root_build_dir)
+        rebased_gdbserver = rebase_path([ android_gdbserver ], root_build_dir)
+        inputs += [ android_gdbserver ]
         args += [
-          "--files=[\"$rebased_gdbserver\"]"
+          "--libraries=$rebased_gdbserver"
         ]
       }
     }