[Devil] Replace generated Devil config with jinja template.

build/android/BUILD.gn

Index: build/android/BUILD.gn
diff --git a/build/android/BUILD.gn b/build/android/BUILD.gn
index 5428875d2ad04ad4658142bb7c41ce7bf610197f..80ca58d96143273eecfec010f193058dfdbfee1c 100644
--- a/build/android/BUILD.gn
+++ b/build/android/BUILD.gn
@@ -77,6 +77,9 @@ action("cpplib_stripped") {
 }
 
 group("devil_py") {
+  deps = [
+    ":devil_chromium_config",
+  ]
   data = [
     "devil_chromium.json",
     "devil_chromium.py",
@@ -92,6 +95,16 @@ group("devil_py") {
   ]
 }
 
+jinja_template("devil_chromium_config") {
+  input = "devil_chromium.jinja"
+  output = "$root_gen_dir/devil_chromium.json"
+  variables = [
+    "output_dir=$root_build_dir",
+    "android_sdk_root=$default_android_sdk_root",
+    "build_tools_version=$default_android_sdk_build_tools_version",
+  ]
+}
+
 group("test_runner_py") {
   data = [
     "test_runner.py",