Misc GN build improvements, mostly Windows.

Added lots of bug references to TODOs.

Added rules for some remoting test files.

Added manifests for chrome.dll, chrome_child.dll, and chrome_elf.dll

TBR=bradnelson for chrome/test/data/nacl

Review URL: https://codereview.chromium.org/1250103002

Cr-Commit-Position: refs/heads/master@{#340009}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 383c4932..7e281f4 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -342,8 +342,8 @@
     sources +=
         rebase_path(gypi_values.chrome_browser_mac_sources, ".", "//chrome")
     deps += [
-      #"app_shim"  TODO(GYP)
-      #"browser_app_shim"  TODO(GYP)
+      #"app_shim"  TODO(GYP) bug 512600
+      #"browser_app_shim"  TODO(GYP) bug 512600
     ]
   }
   if (enable_extensions) {