Make media/capture gn and gyps produce components

media/base/win/BUILD.gn

Index: media/base/win/BUILD.gn
diff --git a/media/base/win/BUILD.gn b/media/base/win/BUILD.gn
index 49559bac0554417fca6368c7f1304e672c4ff5b1..6a2eb93da888fb4c5ddf52cfe66abab14d17d5c4 100644
--- a/media/base/win/BUILD.gn
+++ b/media/base/win/BUILD.gn
@@ -4,7 +4,7 @@
 
 assert(is_win)
 
-source_set("win") {
+component("win") {

[xhwang, 2016/06/09 06:30:46]

Why is this change necessary and be part of this CL?

media:media_implementation should only be used by the "media" target (including
source_sets that are part of the "media" component). Otherwise, since
mf_initializer.h uses MEDIA_EXPORT, it could cause trouble (especially on
windows bots) if we ever have files in the "media" target include
mf_initializer.h.

If you really want to make this a component, then we need a new EXPORT, e.g.
MEDIA_WIN_EXPORT, similar to the new CAPURE_EXPORT you added in this CL.

[mcasas, 2016/06/09 16:07:55]

It is necessary because capture.dll depends on 
this, and so does media/gpu.dll (via 
media/gpu/dxva_video_decode_accelerator_win.cc)
and since now they're each in their own DLL,
I would get linking errors if I don't make
it itself imported for both. This problem
wasn't such before, as there was just
media.dll.
I guess I have to bite the bullet then! :)

   set_sources_assignment_filter([])
   sources = [
     "mf_initializer.cc",
@@ -19,4 +19,14 @@ source_set("win") {
     "//base",
     "//media:shared_memory_support",
   ]
+  libs = [
+    "mf.lib",
+    "mfplat.lib",
+    "mfreadwrite.lib",
+  ]
+  ldflags = [
+    "/DELAYLOAD:mf.dll",
+    "/DELAYLOAD:mfplat.dll",
+    "/DELAYLOAD:mfreadwrite.dll",
+  ]
 }