Android: Add disable_android_lint gn arg.

Lint is slow and annoying when locally prototyping features. This CL
adds a gn arg to disable it globally.

Change-Id: I7a39ea34f4969733ed7562f23e65d997452adc1b
Reviewed-on: https://chromium-review.googlesource.com/1102353
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567727}

build/config/android/config.gni

@@ -209,6 +209,9 @@ if (is_android || is_chromeos) {
     # over the ones in other places. (instead of the support library from
     # android_tools for example)
     enable_android_deps_repository = true
+
+    # Turns off android lint. Useful for prototyping or for faster local builds.
+    disable_android_lint = false
   }
 
   # We need a second declare_args block to make sure we are using the overridden

build/config/android/internal_rules.gni

@@ -3040,7 +3040,8 @@ if (enable_java_templates) {
     }
 
     # TODO(agrieve): Enable lint for _has_sources rather than just _java_files.
-    _has_lint_target = _java_files != [] && _supports_android && _chromium_code
+    _lint_enabled = _java_files != [] && _supports_android && _chromium_code &&
+                    !disable_android_lint
     if (_has_sources) {
       _compile_java_target = "${_main_target_name}__compile_java"
       compile_java(_compile_java_target) {
@@ -3075,12 +3076,16 @@ if (enable_java_templates) {
       }
       _accumulated_public_deps += [ ":$_compile_java_target" ]
 
-      if (_has_lint_target) {
+      if (defined(invoker.android_manifest_for_lint)) {
+        _android_manifest_for_lint = invoker.android_manifest_for_lint
+        assert(_android_manifest_for_lint != "")  # Mark as used.
+      }
+      if (_lint_enabled) {
         android_lint("${_main_target_name}__lint") {
           if (invoker.type == "android_apk") {
             forward_variables_from(invoker, [ "android_manifest" ])
-          } else if (defined(invoker.android_manifest_for_lint)) {
-            android_manifest = invoker.android_manifest_for_lint
+          } else if (defined(_android_manifest_for_lint)) {
+            android_manifest = _android_manifest_for_lint
           }
           build_config = _build_config
           requires_android = _requires_android
@@ -3171,7 +3176,7 @@ if (enable_java_templates) {
           # BuildConfig, NativeLibraries, etc.
           input_jar = _unprocessed_jar_path
           output_jar = _final_ijar_path
-          if (_has_lint_target) {
+          if (_lint_enabled) {
             if (!defined(data_deps)) {
               data_deps = []
             }
@@ -3224,7 +3229,7 @@ if (enable_java_templates) {
                                  "visibility",
                                ])
         public_deps = _accumulated_public_deps
-        if (_has_lint_target) {
+        if (_lint_enabled) {
           if (!defined(data_deps)) {
             data_deps = []
           }