Use shared memory for moving data over BlobChannel Mojo interface.

blimp/engine/BUILD.gn

Index: blimp/engine/BUILD.gn
diff --git a/blimp/engine/BUILD.gn b/blimp/engine/BUILD.gn
index 104665e346a2313065e2495c483d714eceb1baa6..d9f0e324b5cfd7959458270c194d78ded1d97934 100644
--- a/blimp/engine/BUILD.gn
+++ b/blimp/engine/BUILD.gn
@@ -455,6 +455,20 @@ source_set("feature_unit_tests") {
   ]
 }
 
+source_set("renderer_unit_tests") {
+  testonly = true
+
+  sources = [
+    "renderer/blob_channel_sender_proxy_unittest.cc",
+  ]
+
+  deps = [
+    ":renderer",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
 
@@ -462,6 +476,7 @@ source_set("unit_tests") {
     ":app_unit_tests",
     ":common_unit_tests",
     ":feature_unit_tests",
+    ":renderer_unit_tests",
   ]
 }