Fix componene debug build failure because of src/media/blink

The error log is as follows:
../../third_party/skia/include/core/SkImageInfo.h:109: error: undefined reference to 'SkDebugf_FileLine(char const*, int, bool, char const*, ...)'
collect2: error: ld returned 1 exit status

If any modules are going to use any Skia header no matter whether directly or
indirectly, the module must link Skia. src/media/blink doesn't depend on skia
directly but src/media, on which src/media/blink depends, depends on Skia. So
src/media/blink must link to Skia.

Review URL: https://codereview.chromium.org/885373003

Cr-Commit-Position: refs/heads/master@{#314554}

media/blink/BUILD.gn

@@ -15,6 +15,7 @@ component("blink") {
     "//media",
     "//media:shared_memory_support",
     "//net",
+    "//skia",
     "//third_party/WebKit/public:blink",
     "//ui/gfx",
     "//ui/gfx/geometry",

media/blink/media_blink.gyp

@@ -15,6 +15,7 @@
         '../../gpu/blink/gpu_blink.gyp:gpu_blink',
         '../../ui/gfx/gfx.gyp:gfx_geometry',
         '../../net/net.gyp:net',
+        '../../skia/skia.gyp:skia',
         '../../third_party/WebKit/public/blink.gyp:blink',
         '../media.gyp:media',
         '../media.gyp:shared_memory_support',