Update third-party packages to most recent versions

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 50498e521a183db60a32b1a1e66b66a0a72893bf..b20d8b9c6260ade91b1acb0c8a9d8f02aa5e5bb4 100644
--- a/DEPS
+++ b/DEPS
@@ -37,8 +37,8 @@ vars = {
   "gperftools_revision": "@02eeed29df112728564a5dde6417fa4622b57a06",
 
   # Revisions of /third_party/* dependencies.
-  "args_tag": "@0.13.5",
-  "async_tag": "@1.11.3",
+  "args_tag": "@0.13.7",
+  "async_tag": "@1.13.0",
   "barback-0.13.0_rev": "@34853",
   "barback-0.14.0_rev": "@36398",
   "barback-0.14.1_rev": "@38525",
@@ -47,72 +47,73 @@ vars = {
   "boolean_selector_tag" : "@1.0.2",
   "boringssl_gen_rev": "@1a810313a0290e1caace9da73fa3ab89995ad2c7",
   "boringssl_rev" : "@d519bf6be0b447fb80fbc539d4bff4479b5482a2",
-  "charcode_tag": "@1.1.0",
+  "charcode_tag": "@v1.1.1",
   "chrome_rev" : "@19997",
   "cli_util_tag" : "@0.0.1+3",
-  "code_transformers_tag": "@v0.4.2+3",
-  "collection_tag": "@1.10.1",
+  "code_transformers_tag": "@v0.5.1",
+  "collection_tag": "@1.13.0",
   "convert_tag": "@2.0.1",
   "crypto_tag" : "@2.0.1",
-  "csslib_tag" : "@0.13.2",
+  "csslib_tag" : "@0.13.3+1",
   "dart2js_info_tag" : "@0.5.3+1",
   "dart_services_rev" : "@7aea2574e6f3924bf409a80afb8ad52aa2be4f97",
   "dart_style_tag": "@0.2.16",
-  "dartdoc_tag" : "@v0.9.8+1",
+  "dartdoc_tag" : "@v0.9.12",
   "fixnum_tag": "@0.10.5",
-  "func_tag": "@0.1.0",
+  "func_tag": "@0.1.1",
   "glob_tag": "@1.1.3",
   "html_tag" : "@0.13.1",
-  "http_multi_server_tag" : "@2.0.2",
-  "http_parser_tag" : "@3.0.3",
+  "http_multi_server_tag" : "@2.0.3",
+  "http_parser_tag" : "@3.1.1",
   "http_tag" : "@0.11.3+9",
   "http_throttle_rev" : "@284344cd357e435c6c8ff9a4a21f02b9e384a541",
   "idl_parser_rev": "@7fbe68cab90c38147dee4f48c30ad0d496c17915",
-  "initialize_tag": "@v0.6.2+2",
+  "initialize_tag": "@v0.6.2+5",
   "intl_tag": "@0.14.0",
   "isolate_tag": "@1.0.0",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
-  "json_rpc_2_tag": "@2.0.2",
-  "linter_rev": "@89f93362c5b48ef5192d77e9a28cf9590542669b",
+  "json_rpc_2_tag": "@2.0.4",
+  "linter_rev": "@89f93362c5b48ef5192d77e9a28cf9590542669b", # prerelease 1.30
   "logging_tag": "@0.11.3+1",
-  "markdown_tag": "@0.11.0",
+  "markdown_tag": "@0.11.2",
   "matcher_tag": "@0.12.0+2",
-  "metatest_tag": "@0.2.2+2",
+  "metatest_tag": "@0.2.2+3",
   "mime_rev": "@75890811d4af5af080351ba8a2853ad4c8df98dd",
   "mustache4dart_tag" : "@v1.0.10",
   "oauth2_tag": "@1.0.2",
+  "observable_tag": "@0.17.0",
   "observatory_pub_packages_rev": "@26aad88f1c1915d39bbcbff3cad589e2402fdcf1",
-  "observe_tag": "@0.13.5",
+  "observe_tag": "@0.15.0",
   "package_config_tag": "@1.0.0",
   "package_resolver_tag": "@1.0.2+1",
   "path_tag": "@1.4.1",
   "plugin_tag": "@0.2.0",
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
-  "pool_tag": "@1.2.4",
+  "pool_tag": "@1.3.0",
   "protobuf_tag": "@0.5.3",
   "pub_rev": "@53327f4a7ca2ddd20a40f6a94db61ac136371b03",
-  "pub_semver_tag": "@1.3.0",
+  "pub_semver_tag": "@1.3.2",
   "quiver_tag": "@0.22.0",
   "resource_rev":"@a49101ba2deb29c728acba6fb86000a8f730f4b1",
   "root_certificates_rev": "@0068d8911140e591ebb750af296e81940a9906f5",
-  "scheduled_test_tag": "@0.12.6",
+  "scheduled_test_tag": "@0.12.9",
   "shelf_static_tag": "@0.2.4",
   "shelf_packages_handler_tag": "@1.0.0",
-  "shelf_tag": "@0.6.5+3",
+  "shelf_tag": "@0.6.7+2",
   "shelf_web_socket_tag": "@0.2.1",
   "smoke_tag" : "@v0.3.6+2",
-  "source_map_stack_trace_tag": "@1.1.3",
+  "source_map_stack_trace_tag": "@1.1.4",
   "source_maps-0.9.4_rev": "@38524",
-  "source_maps_tag": "@0.10.1+2",
-  "source_span_tag": "@1.2.4",
-  "stack_trace_tag": "@1.6.6",
-  "stream_channel_tag": "@1.5.0",
-  "string_scanner_tag": "@1.0.0",
+  "source_maps_tag": "@0.10.2",
+  "source_span_tag": "@1.3.1",
+  "stack_trace_tag": "@1.7.1",
+  "stream_channel_tag": "@1.6.1",
+  "string_scanner_tag": "@1.0.1",
   "sunflower_rev": "@879b704933413414679396b129f5dfa96f7a0b1e",
   "test_reflective_loader_tag": "@0.1.0",
-  "test_tag": "@0.12.15+6",
+  "test_tag": "@0.12.18+1",
   "typed_data_tag": "@1.1.3",
-  "usage_tag": "@v2.2.2",
+  "usage_tag": "@v3.0.0+1",
   "utf_tag": "@0.9.0+3",
   "watcher_tag": "@0.9.7+3",
   "web_components_rev": "@6349e09f9118dce7ae1b309af5763745e25a9d61",
@@ -120,7 +121,7 @@ vars = {
   "WebCore_rev": "@a86fe28efadcfc781f836037a80f27e22a5dad17",
   "when_tag": "@0.2.0+2",
   "which_tag": "@0.1.3+1",
-  "yaml_tag": "@2.1.11",
+  "yaml_tag": "@2.1.12",
   "zlib_rev": "@c3d0a6190f2f8c924a05ab6cc97b8f975bddd33f",
 }
 
@@ -252,6 +253,8 @@ deps = {
       + Var("mustache4dart_tag"),
   Var("dart_root") + "/third_party/pkg/oauth2":
       (Var("github_mirror") % "oauth2") + Var("oauth2_tag"),
+  Var("dart_root") + "/third_party/pkg/observable":
+      (Var("github_dartlang") % "observable") + Var("observable_tag"),
   Var("dart_root") + "/third_party/pkg/observe":
       (Var("github_mirror") % "observe") + Var("observe_tag"),
   Var("dart_root") + "/third_party/observatory_pub_packages":