Adding third_party/openh264 build files for encoding

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 176e85589db0163c1d505db2a375348474b10704..c2da22638d1ebc399b9ce6b83c3ae7b7d6f46f7e 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -10,6 +10,9 @@
     # For Android-specific targets.
     'android_app_targets%': [],
   },
+  'includes': [
+    '../third_party/openh264/openh264_args.gypi',
+  ],
   'targets': [
     {
       'target_name': 'All',
@@ -30,6 +33,7 @@
         '../testing/gtest.gyp:*',
         '../third_party/icu/icu.gyp:*',
         '../third_party/libxml/libxml.gyp:*',
+        '../third_party/openh264/testing/openh264_unittests.gyp:*',
         '../third_party/sqlite/sqlite.gyp:*',
         '../third_party/zlib/zlib.gyp:*',
         '../ui/accessibility/accessibility.gyp:*',
@@ -287,6 +291,11 @@
             '../envoy/envoy.gyp:*',
           ],
         }],
+        ['use_openh264==1', {
+          'dependencies': [
+            '../third_party/openh264/openh264.gyp:*',
+          ],
+        }],
       ],
     }, # target_name: All
     {