GN: Some small changes to support chrome android internal stuff

This actually hooks up (i.e. passes from invoker) several variables
controlling apk creation (version name, version code,
use_relocation_packer, use_chromium_linker, unzip_libraries_from_apk).

Adds support for overriding some configuration in the private repo.

Adds support for public_configs in grit_rule.gni.

Adds some junit targets (these are built as android libraries currently
instead of host libraries, but that just means we do a bit extra work
that we don't really need).

BUG=359249

Review URL: https://codereview.chromium.org/659703002

Cr-Original-Commit-Position: refs/heads/master@{#301039}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: ca675d3ec565477b2e3bae8b0709a412d029fa21

config/android/config.gni

@@ -5,12 +5,25 @@
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
+  has_chrome_android_internal = exec_script("//build/dir_exists.py",
+          [ rebase_path("//clank", root_build_dir) ],
+          "string") == "True"
+
+  if (has_chrome_android_internal) {
+    import("//clank/config.gni")
+  } else {
+    default_android_sdk_root = "//third_party/android_tools/sdk"
+    default_android_sdk_version = "21"
+    default_android_sdk_build_tools_version = "21.0.0"
+  }
+
   declare_args() {
     # Absolute directory containing the Android source code.
     android_src = ""
 
-    android_sdk_root = "//third_party/android_tools/sdk"
-    android_sdk_version = "21"
+    android_sdk_root = default_android_sdk_root
+    android_sdk_version = default_android_sdk_version
+    android_sdk_build_tools_version = default_android_sdk_build_tools_version
 
     # This is set when building the Android WebView inside the Android build
     # system, using the 'android' gyp backend. The WebView code is still built
@@ -32,7 +45,6 @@ if (is_android) {
            "You must specify android_src for an Android WebView build.")
   }
 
-
   # Host stuff -----------------------------------------------------------------
 
   # Defines the name the Android build gives to the current host CPU
@@ -68,7 +80,7 @@ if (is_android) {
   android_sdk = "${android_sdk_root}/platforms/android-${android_sdk_version}"
 
   android_sdk_tools = "${android_sdk_root}/tools"
-  android_sdk_build_tools = "${android_sdk_root}/build-tools/21.0.0"
+  android_sdk_build_tools = "${android_sdk_root}/build-tools/$android_sdk_build_tools_version"
 
   # Path to the SDK's android.jar
   android_sdk_jar = "$android_sdk/android.jar"

config/android/internal_rules.gni

@@ -253,8 +253,8 @@ template("create_apk") {
     _asset_location = invoker.asset_location
   }
 
-  _version_code = "1"
-  _version_name = "Developer Build"
+  _version_code = invoker.version_code
+  _version_name = invoker.version_name
 
   _base_apk_path = _base_path + ".apk_intermediates"
 
@@ -557,7 +557,7 @@ template("android_java_library") {
   if (defined(invoker.testonly)) { testonly = invoker.testonly }
 
   assert(defined(invoker.java_files) || defined(invoker.DEPRECATED_java_in_dir)
-      || defined(invoker.srcjars))
+      || defined(invoker.srcjars) || defined(invoker.srcjar_deps))
   assert(defined(invoker.build_config))
   assert(defined(invoker.jar_path))
   assert(defined(invoker.dex_path))

config/android/rules.gni

@@ -420,6 +420,8 @@ template("jinja_template_resources") {
   _build_config = _base_path + ".build_config"
 
   write_build_config("${target_name}__build_config") {
+    build_config = _build_config
+    resources_zip = _resources_zip
     type = "android_resources"
   }
 
@@ -679,7 +681,7 @@ template("android_library") {
   if (defined(invoker.testonly)) { testonly = invoker.testonly }
 
   assert(defined(invoker.java_files) || defined(invoker.DEPRECATED_java_in_dir)
-      || defined(invoker.srcjars))
+      || defined(invoker.srcjars) || defined(invoker.srcjar_deps))
   _base_path = "$target_gen_dir/$target_name"
   _build_config = _base_path + ".build_config"
   _jar_path = _base_path + ".jar"
@@ -989,6 +991,12 @@ template("android_apk") {
         "$root_build_dir/lib.stripped/libchromium_android_linker.so"
       ]
     }
+
+    _enable_relocation_packing = false
+    if (_use_chromium_linker && defined(invoker.enable_relocation_packing) &&
+        invoker.enable_relocation_packing) {
+      _enable_relocation_packing = true
+    }
   }
 
   _rebased_build_config = rebase_path(build_config, root_build_dir)
@@ -1157,6 +1165,16 @@ template("android_apk") {
     dex_path = final_dex_path
     load_library_from_apk = _load_library_from_apk
 
+    version_code = "1"
+    if (defined(invoker.version_code)) {
+      version_code = invoker.version_code
+    }
+
+    version_name = "Developer Build"
+    if (defined(invoker.version_name)) {
+      version_name = invoker.version_name
+    }
+
     if (defined(invoker.asset_location)) {
       asset_location = invoker.asset_location
     }

secondary/tools/grit/grit_rule.gni

@@ -330,6 +330,10 @@ template("grit") {
     deps = [ ":$grit_custom_target" ]
     public_configs = [ ":$grit_config" ]
 
+    if (defined(invoker.public_configs)) {
+      public_configs += invoker.public_configs
+    }
+
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }