Enabling 64-bit mojo shell to launch 32-bit child to handle nonsfi content.

shell/BUILD.gn

Index: shell/BUILD.gn
diff --git a/shell/BUILD.gn b/shell/BUILD.gn
index 56c6596b7a2dcf4a4bd75664c3d6463b1fad1916..a83a9cbf8c46342f9c552ebf040f7ea80b6cc9b6 100644
--- a/shell/BUILD.gn
+++ b/shell/BUILD.gn
@@ -83,7 +83,7 @@ if (!mojo_use_prebuilt_mojo_shell) {
         "desktop/main.cc",
       ]
 
-      deps = shell_common_deps
+      deps = shell_common_deps + [ ":mojo_shell_child_x86" ]
 
       data_deps = shell_common_data_deps
     }
@@ -105,6 +105,16 @@ if (!mojo_use_prebuilt_mojo_shell) {
       "//mojo/message_pump",
     ]
   }
+
+  group("mojo_shell_child_x86") {

[Petr Hosek, 2015/09/14 19:13:51]

Ditto here.

[Sean Klein, 2015/09/15 18:37:50]

Naming "mojo_shell_child_32_bit", since "mojo_shell_child" is already taken and
may imply the 64 bit version.

+    # This group is required to run any 32-bit child process.
+    deps = []
+    if ((target_cpu == "x64" || target_cpu == "x86") && is_linux) {
+      deps = [
+        ":mojo_shell_child(//build/toolchain/linux:clang_x86)",

[Mark Seaborn, 2015/09/14 18:38:58]

Nit: Shouldn't this come with the same warning as you added in
https://codereview.chromium.org/1327913004?

[Sean Klein, 2015/09/15 18:37:50]

Done.

+      ]
+    }
+  }
 }  # !mojo_use_prebuilt_mojo_shell
 
 # Files used both by mojo_shell and mojo_shell_child (and tests).