cc:: Add remote mode to the compositor

cc/proto/compositor_message_to_main.proto

Index: cc/proto/compositor_message_to_main.proto
diff --git a/cc/proto/managed_memory_policy.proto b/cc/proto/compositor_message_to_main.proto
similarity index 50%
copy from cc/proto/managed_memory_policy.proto
copy to cc/proto/compositor_message_to_main.proto
index 9f42a6a65f6452c3f772ee01516259b9709bc413..60a6914fcfbbc206a733a7f1d1380dc18ffe9d98 100644
--- a/cc/proto/managed_memory_policy.proto
+++ b/cc/proto/compositor_message_to_main.proto
@@ -4,14 +4,13 @@
 
 syntax = "proto2";
 
-import "memory_allocation.proto";
+option optimize_for = LITE_RUNTIME;
 
 package cc.proto;
 
-option optimize_for = LITE_RUNTIME;
-
-message ManagedMemoryPolicy {
-  optional uint32 bytes_limit_when_visible = 1;
-  optional MemoryAllocation.PriorityCutoff priority_cutoff_when_visible = 2;
-  optional uint32 num_resources_limit = 3;
+// Control messages sent to the main side of the compositor(server) from the
+// impl side of the compositor(client).
+message CompositorMessageToMain {
+  // TODO(khushalsagar): Add messages sent to the main compositor from the impl
+  // side.
 }