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 fcc65cd322591770740f1bf690b641fc135eca87..279ae44a74267f58143d28fe9b69844f06dffb1e 100644
--- a/blimp/engine/BUILD.gn
+++ b/blimp/engine/BUILD.gn
@@ -457,6 +457,22 @@ source_set("feature_unit_tests") {
   ]
 }
 
+source_set("renderer_unit_tests") {
+  testonly = true
+
+  sources = [
+    "renderer/blob_channel_sender_proxy_unittest.cc",
+  ]
+
+  deps = [
+    ":renderer",
+    "//blimp/net:test_support",
+    "//mojo/public",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
 
@@ -464,6 +480,7 @@ source_set("unit_tests") {
     ":app_unit_tests",
     ":common_unit_tests",
     ":feature_unit_tests",
+    ":renderer_unit_tests",
   ]
 }