Add VP9 codec to VCM and vie_auto_test.

Include VP9 tests in videoprocessor_integrationtests.
Include end-to-end send/receiveVP9 test.

This is the same patch as https://code.google.com/p/webrtc/source/detail?r=7422, which was reverted when rolled into chrome (due to bss size increase). Relanding this again as we now have the clear to get this in:
see https://code.google.com/p/webrtc/issues/detail?id=3932

R=kjellander@webrtc.org, mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/31829004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7588 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/BUILD.gn

@@ -77,6 +77,7 @@ source_set("video_coding") {
     ":video_coding_utility",
     ":webrtc_i420",
     ":webrtc_vp8",
+    ":webrtc_vp9",
     "../../common_video",
     "../../system_wrappers",
   ]
@@ -159,3 +160,35 @@ source_set("webrtc_vp8") {
     ]
   }
 }
+
+source_set("webrtc_vp9") {
+  sources = [
+    "codecs/vp9/include/vp9.h",
+    "codecs/vp9/vp9_impl.cc",
+    "codecs/vp9/vp9_impl.h",
+  ]
+
+  configs += [ "../..:common_config" ]
+  public_configs = [ "../..:common_inherited_config" ]
+
+  if (is_clang) {
+    # Suppress warnings from Chrome's Clang plugins.
+    # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
+    configs -= [ "//build/config/clang:find_bad_constructs" ]
+  }
+
+  # TODO(kjellander): Remove once libvpx has changed it's libvpx_config to be
+  # in direct_dependent_configs.
+  configs += [ "//third_party/libvpx:libvpx_config" ]
+
+  deps = [
+    ":video_coding_utility",
+    "../../common_video",
+    "../../system_wrappers",
+  ]
+  if (rtc_build_libvpx) {
+    deps += [
+      "//third_party/libvpx",
+    ]
+  }
+}