Added compile-time switch to enable GCD in host.

With this change, the decision to use GCD or the legacy registry is
made entirely at compile time by setting the value of
|remoting_use_gcd| in gyp.

This change is in preparation for a future change that will allow a
host to determine at runtime, based on a GCD query, whether or not it
is registered with GCD (as opposed to the legacy registry).  At that
point, the compile-time switch will determine whether or not the host
attempts to connect to GCD before using the legacy registry as a
fallback.

BUG=503804

Review URL: https://codereview.chromium.org/1215173002

Cr-Commit-Position: refs/heads/master@{#339206}

1 files changed, 10 insertions, 0 deletions

diff --git a/remoting/remoting_host.gypi b/remoting/remoting_host.gypi
index ded5f03..39aa213 100644
--- a/remoting/remoting_host.gypi
+++ b/remoting/remoting_host.gypi
@@ -187,6 +187,11 @@
                 '<@(remoting_cast_sources)',
               ],
             }],
+            ['remoting_use_gcd==1', {
+              'defines': [
+                'USE_GCD',
+              ]
+            }],
           ],
         },  # end of target 'remoting_host'
 
@@ -447,6 +452,11 @@
                 'USE_REMOTING_MACOSX_INTERNAL'
               ],
             }],
+            ['remoting_use_gcd==1', {
+              'defines': [
+                'USE_GCD',
+              ]
+            }],
           ],  # end of 'conditions'
         },  # end of target 'remoting_me2me_host_static'
       ]  # end of targets