Add rudimentary UpdateService to app_shell

It can download a CRX from the web store using an ID given at the
command line.

This wires up utility process support for app_shell and establishes
a base for factoring additional extensions utility IPCs out of
//chrome in the near future.

BUG=398671
TBR=asargent@chromium.org for cloned dependency on omaha_query_params

Review URL: https://codereview.chromium.org/693233003

Cr-Commit-Position: refs/heads/master@{#303055}

2 files changed, 4 insertions, 0 deletions

diff --git a/extensions/shell/common/switches.cc b/extensions/shell/common/switches.cc
index 4b0ccc0..eef7cc9 100644
--- a/extensions/shell/common/switches.cc
+++ b/extensions/shell/common/switches.cc
@@ -13,6 +13,9 @@ const char kAppShellAppPath[] = "app-shell-app-path";
 // Bounds for the host window to create (i.e. "800x600").
 const char kAppShellHostWindowBounds[] = "app-shell-host-window-bounds";
 
+// ID of an extension CRX to be downloaded from the web store.
+const char kAppShellInstallCrx[] = "app-shell-install-crx";
+
 // SSID of the preferred WiFi network.
 const char kAppShellPreferredNetwork[] = "app-shell-preferred-network";
 
diff --git a/extensions/shell/common/switches.h b/extensions/shell/common/switches.h
index 30196ae..2c57677 100644
--- a/extensions/shell/common/switches.h
+++ b/extensions/shell/common/switches.h
@@ -12,6 +12,7 @@ namespace switches {
 // alongside the definition of their values in the .cc file.
 extern const char kAppShellAppPath[];
 extern const char kAppShellHostWindowBounds[];
+extern const char kAppShellInstallCrx[];
 extern const char kAppShellPreferredNetwork[];
 extern const char kAppShellRefreshToken[];
 extern const char kAppShellUser[];