Move androidx dependencies to dedicated folder part 1/3

This CL:
- Adds --android-deps-dir parameter to fetch_all.py This avoids having
  to place the androidx build.gradle in
  //third_party/androidx/third_party/android_deps/build.gradle
- Adds 'internalTargetVisibility' parameter to build.gradle. This will
  be used to enable //third_party/android_deps to depend on
  //third_party/androidx targets
- Removes 'depsPath' parameter in build.gradle and changes fetch_all.py
  to ignore --android-deps-dir parameter in computation of where in build
  directory DEPS is copied ot.
- Adds //third_party/android_deps to the 'ANDROID_DEPS' environment
  variable when running jetification. This fixes jetification for
  internal chrome

BUG=1064277

Change-Id: I2165846c032071315581278036bcee4ccea97262
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422518
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809196}

third_party/android_deps/build.gradle

@@ -234,7 +234,7 @@ dependencies {
 task setUpRepository(type: BuildConfigGenerator) {
     // Paths are relative to the chromium source root.
     repositoryPath 'third_party/android_deps'
-    depsPath 'DEPS'
     chromiumSourceRoot '../..'
     cipdBucket 'chromium'
+    internalTargetVisibility = [ ':*' ]
 }

third_party/android_deps/buildSrc/src/main/groovy/BuildConfigGenerator.groovy

@@ -56,11 +56,6 @@ class BuildConfigGenerator extends DefaultTask {
      */
     String repositoryPath
 
-    /**
-     * Relative path to the DEPS file where the cipd packages are specified.
-     */
-    String depsPath
-
     /**
      * Relative path to the Chromium source root from the build.gradle file.
      */
@@ -88,6 +83,11 @@ class BuildConfigGenerator extends DefaultTask {
      */
     boolean onlyPlayServices
 
+    /**
+     * Array with visibility for targets which are not listed in build.gradle
+     */
+    String[] internalTargetVisibility
+
     @TaskAction
     void main() {
         skipLicenses = skipLicenses || project.hasProperty("skipLicenses")
@@ -149,17 +149,19 @@ class BuildConfigGenerator extends DefaultTask {
         downloadExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
 
         // 3. Generate the root level build files
-        updateBuildTargetDeclaration(graph, "${normalisedRepoPath}/BUILD.gn", onlyPlayServices)
+        updateBuildTargetDeclaration(graph, repositoryPath, normalisedRepoPath, onlyPlayServices,
+            internalTargetVisibility)
         updateDepsDeclaration(graph, cipdBucket, stripFromCipdPath, repositoryPath,
-                              "${rootDirPath}/${depsPath}", onlyPlayServices)
+                              "${rootDirPath}/DEPS", onlyPlayServices)
         dependencyDirectories.sort { path1, path2 -> return path1.compareTo(path2) }
         updateReadmeReferenceFile(dependencyDirectories,
                                   "${normalisedRepoPath}/additional_readme_paths.json")
     }
 
-    private static void updateBuildTargetDeclaration(ChromiumDepGraph depGraph, String path,
-                                                     boolean onlyPlayServices) {
-        File buildFile = new File(path)
+    private static void updateBuildTargetDeclaration(ChromiumDepGraph depGraph,
+            String repositoryPath, String normalisedRepoPath, boolean onlyPlayServices,
+            String[] internalTargetVisibility) {
+        File buildFile = new File("${normalisedRepoPath}/BUILD.gn");
         def sb = new StringBuilder()
 
         // Comparator to sort the dependency in alphabetical order, with the visible ones coming
@@ -229,8 +231,8 @@ class BuildConfigGenerator extends DefaultTask {
 
             if (!dependency.visible) {
               sb.append("  # To remove visibility constraint, add this dependency to\n")
-              sb.append("  # //third_party/android_deps/build.gradle.\n")
-              sb.append("  visibility = [ \":*\" ]\n")
+              sb.append("  # //${repositoryPath}/build.gradle.\n")
+              sb.append("  visibility = " + makeGnArray(internalTargetVisibility) + "\n")
             }
             if (dependency.testOnly) sb.append("  testonly = true\n")
             if (!depsStr.empty) sb.append("  deps = [${depsStr}]\n")
@@ -569,6 +571,18 @@ class BuildConfigGenerator extends DefaultTask {
         return project.file("${chromiumSourceRoot}/${pathRelativeToChromiumRoot}").absolutePath
     }
 
+    private static String makeGnArray(String[] values) {
+       def sb = new StringBuilder();
+       sb.append("[");
+       for (String value : values) {
+           sb.append("\"");
+           sb.append(value);
+           sb.append("\",");
+       }
+       sb.replace(sb.length() - 1, sb.length(), "]");
+       return sb.toString();
+    }
+
     static String makeOwners() {
         // Make it easier to upgrade existing dependencies without full third_party review.
         return "file://third_party/android_deps/OWNERS"