Enable the embedded L1/EME support in WebView.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index ddd6546f379437be9af2d050f59f8c5e0091df40..c6b63ba1e3ad92fc23e1d1e363f96a184821345e 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1254,6 +1254,9 @@
     # Force disable libstdc++ debug mode.
     'disable_glibcxx_debug%': 0,
 
+    # Set to 1 to compile with the hole punching for the protected video.
+    'video_hole%': 0,
+
     'conditions': [
       # The version of GCC in use, set later in platforms that use GCC and have
       # not explicitly chosen to build with clang. Currently, this means all
@@ -2460,6 +2463,9 @@
       ['enable_ipc_fuzzer==1', {
         'defines': ['ENABLE_IPC_FUZZER=1'],
       }],
+      ['video_hole==1', {
+        'defines': ['VIDEO_HOLE=1'],
+      }],
     ],  # conditions for 'target_defaults'
     'target_conditions': [
       ['enable_wexit_time_destructors==1', {