Merge changes I403ffbf7,I62891082,Iac185d3a,I2b78a7b8

* changes:
  cronet import: add test dependencies that were imported in aosp/2399270
  cronet import: use folder.origin instead of git.origin
  cronet import: use public chromium repository as a source
  cronet import: add --git-origin-checkout-hook to run gclient
diff --git a/Cronet/tools/import/copy.bara.sky b/Cronet/tools/import/copy.bara.sky
index 2acf8cd..c066fc0 100644
--- a/Cronet/tools/import/copy.bara.sky
+++ b/Cronet/tools/import/copy.bara.sky
@@ -19,6 +19,7 @@
 
     # Exclude existing *OWNERS files
     "**/*OWNERS",
+    "**/.git/**",
 ]
 
 cronet_origin_files = glob(
@@ -35,6 +36,8 @@
         "crypto/**",
         "ipc/**",
         "net/**",
+        # Note: Only used for tests.
+        "testing/**",
         "url/**",
         "LICENSE",
     ],
@@ -48,6 +51,8 @@
         "components/cronet/ios/**",
         "components/cronet/native/**",
 
+        # Per aosp/2399270
+        "testing/buildbot/**",
 
         # Exclude all third-party directories. Those are specified explicitly
         # below, so no dependency can accidentally creep in.
@@ -69,10 +74,10 @@
         "base/third_party/symbolize/**",
         "base/third_party/valgrind/**",
         "base/third_party/xdg_user_dirs/**",
-        # Not present in source repo; requires gclient sync.
         "buildtools/third_party/libc++/**",
-        # Not present in source repo; requires gclient sync.
         "buildtools/third_party/libc++abi/**",
+        # Note: Only used for tests.
+        "net/third_party/nist-pkits/**",
         "net/third_party/quiche/**",
         "net/third_party/uri_template/**",
         "third_party/abseil-cpp/**",
@@ -80,12 +85,21 @@
         "third_party/ashmem/**",
         "third_party/boringssl/**",
         "third_party/brotli/**",
-        # Not present in source repo; requires gclient sync.
+        # Note: Only used for tests.
+        "third_party/ced/**",
+        # Note: Only used for tests.
+        "third_party/googletest/**",
         "third_party/icu/**",
         "third_party/libevent/**",
+        # Note: Only used for tests.
+        "third_party/libxml/**",
+        # Note: Only used for tests.
+        "third_party/lss/**",
         "third_party/metrics_proto/**",
         "third_party/modp_b64/**",
         "third_party/protobuf/**",
+        # Note: Only used for tests.
+        "third_party/quic_trace/**",
         "third_party/zlib/**",
     ],
     exclude = common_excludes,
@@ -94,12 +108,8 @@
 core.workflow(
     name = "import_cronet",
     authoring = authoring.overwrite("Cronet Mainline Eng <cronet-mainline-eng+copybara@google.com>"),
-    origin = git.origin(
-        url = "rpc://chromium/chromium/src",
-        # Source ref is set by the invoking script.
-        ref = "overwritten-by-script",
-        partial_fetch = True,
-    ),
+    # Origin folder is specified via source_ref argument, see import_cronet.sh
+    origin = folder.origin(),
     origin_files = cronet_origin_files,
     destination = git.destination(
         # The destination URL is set by the invoking script.
diff --git a/Cronet/tools/import/import_cronet.sh b/Cronet/tools/import/import_cronet.sh
index eb82551..d0c8deb 100755
--- a/Cronet/tools/import/import_cronet.sh
+++ b/Cronet/tools/import/import_cronet.sh
@@ -33,6 +33,8 @@
     exit 1
 }
 
+COPYBARA_FOLDER_ORIGIN="/tmp/copybara-origin"
+
 #######################################
 # Create upstream-import branch in external/cronet.
 # Globals:
@@ -49,22 +51,59 @@
 }
 
 #######################################
+# Setup folder.origin for copybara inside /tmp
+# Globals:
+#   COPYBARA_FOLDER_ORIGIN
+# Arguments:
+#   new_rev, string
+#######################################
+setup_folder_origin() {
+    local _new_rev=$1
+    mkdir -p "${COPYBARA_FOLDER_ORIGIN}"
+    cd "${COPYBARA_FOLDER_ORIGIN}"
+
+    # For this to work _new_rev must be a branch or a tag.
+    git clone --depth=1 --branch "${_new_rev}" https://chromium.googlesource.com/chromium/src.git
+
+    cat <<EOF >.gclient
+solutions = [
+  {
+    "name": "src",
+    "url": "https://chromium.googlesource.com/chromium/src.git",
+    "managed": False,
+    "custom_deps": {},
+    "custom_vars": {},
+  },
+]
+target_os = ["android"]
+EOF
+    cd src
+    # Set appropriate gclient flags to speed up syncing.
+    gclient sync \
+        --no-history
+        --shallow
+}
+
+#######################################
 # Runs the copybara import of Chromium
 # Globals:
 #   ANDROID_BUILD_TOP
+#   COPYBARA_FOLDER_ORIGIN
 # Arguments:
-#   new_rev, string
 #   last_rev, string or empty
 #   force, string or empty
 #######################################
 do_run_copybara() {
-    local _new_rev=$1
-    local _last_rev=$2
-    local _force=$3
+    local _last_rev=$1
+    local _force=$2
 
     local -a flags
     flags+=(--git-destination-url="file://${ANDROID_BUILD_TOP}/external/cronet")
-    flags+=(--repo-timeout 3h)
+    flags+=(--repo-timeout 3m)
+
+    # buildtools/third_party/libc++ contains an invalid symlink
+    flags+=(--folder-origin-ignore-invalid-symlinks)
+    flags+=(--git-no-verify)
 
     if [ ! -z "${_force}" ]; then
         flags+=(--force)
@@ -77,7 +116,7 @@
     /google/bin/releases/copybara/public/copybara/copybara \
         "${flags[@]}" \
         "${ANDROID_BUILD_TOP}/packages/modules/Connectivity/Cronet/tools/import/copy.bara.sky" \
-        import_cronet "${_new_rev}"
+        import_cronet "${COPYBARA_FOLDER_ORIGIN}/src"
 }
 
 while getopts $OPTSTRING opt; do
@@ -96,5 +135,6 @@
 fi
 
 setup_upstream_import_branch
-do_run_copybara "${new_rev}" "${last_rev}" "${force}"
+setup_folder_origin "${new_rev}"
+do_run_copybara "${last_rev}" "${force}"