Add basic support for GetChannel
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index f3be712..a10cfb5 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -357,6 +357,7 @@
                       'src/core/lib/channel/channel_stack.h',
                       'src/core/lib/channel/channel_stack_builder.h',
                       'src/core/lib/channel/channel_trace.h',
+                      'src/core/lib/channel/channelz.h',
                       'src/core/lib/channel/channelz_registry.h',
                       'src/core/lib/channel/connected_channel.h',
                       'src/core/lib/channel/context.h',
@@ -507,6 +508,7 @@
                       'src/core/lib/channel/channel_stack.cc',
                       'src/core/lib/channel/channel_stack_builder.cc',
                       'src/core/lib/channel/channel_trace.cc',
+                      'src/core/lib/channel/channelz.cc',
                       'src/core/lib/channel/channelz_registry.cc',
                       'src/core/lib/channel/connected_channel.cc',
                       'src/core/lib/channel/handshaker.cc',
@@ -935,6 +937,7 @@
                               'src/core/lib/channel/channel_stack.h',
                               'src/core/lib/channel/channel_stack_builder.h',
                               'src/core/lib/channel/channel_trace.h',
+                              'src/core/lib/channel/channelz.h',
                               'src/core/lib/channel/channelz_registry.h',
                               'src/core/lib/channel/connected_channel.h',
                               'src/core/lib/channel/context.h',