Add Intel DRM backed GpuMemoryBuffer implementation.

content/content_common.gypi

Index: content/content_common.gypi
diff --git a/content/content_common.gypi b/content/content_common.gypi
index 5f51794e7754801295cdc3bf08c2f067fc24f842..e5b5196d1c93f44ac1de8a884864b11b65a96611 100644
--- a/content/content_common.gypi
+++ b/content/content_common.gypi
@@ -553,6 +553,20 @@
         'content.gyp:common_aidl',
       ],
     }],
+    ['OS=="linux"', {
+      'dependencies': [
+        '<(DEPTH)/build/linux/system.gyp:dridrm',
+      ],
+      'sources': [
+        'common/gpu/client/gpu_memory_buffer_impl_intel_drm.cc',
+        'common/gpu/client/gpu_memory_buffer_impl_intel_drm.h',
+      ],
+      'link_settings': {
+        'libraries': [
+          '-ldrm_intel',
+        ],
+      },
+    }],
     ['toolkit_uses_gtk == 1', {
       'dependencies': [
         '../build/linux/system.gyp:gtk',