Statically link libprotobuf_lite on Linux component builds

third_party/protobuf/README.chromium

Index: third_party/protobuf/README.chromium
diff --git a/third_party/protobuf/README.chromium b/third_party/protobuf/README.chromium
index 8838fbc2715f88ba266247fb32e58147b04ad0a0..edb4d6f1c58234adf3daceaf8376b142b0117a49 100644
--- a/third_party/protobuf/README.chromium
+++ b/third_party/protobuf/README.chromium
@@ -26,7 +26,18 @@ Steps used to create the current version:
 
    For future releases, it will be worth looking into which patches still need
    to be applied.
-5. Generate descriptor_pb2.py using something like the following steps. Make
+5. Extract all globals to src/google/protobuf/globals.cc and prefix these
+   symbols with 'cr_'.  On Linux, the command
+
+   $ objdump -t -j.data -j.bss obj/third_party/protobuf/libprotobuf_lite.a
+
+   should produce the output
+
+   objdump: section '.bss' mentioned in a -j option, but not found in any input file
+   objdump: section '.data' mentioned in a -j option, but not found in any input file
+
+   This will require updating 0012-extract-globals.patch.
+6. Generate descriptor_pb2.py using something like the following steps. Make
    sure you've regenerated your buildfiles and will build protoc from the
    newly-modified sources above.
 
@@ -35,8 +46,8 @@ Steps used to create the current version:
    $ cd third_party/protobuf/src
    $ ../../../out/Debug/protoc --python_out=../python google/protobuf/descriptor.proto
 
-6. Add an __init__.py to protobuf/ that adds third_party/six/ to Python path.
-7. Update README.chromium.
+7. Add an __init__.py to protobuf/ that adds third_party/six/ to Python path.
+8. Update README.chromium.
 
 Description of the patches:
 
@@ -76,3 +87,11 @@ Description of the patches:
   removed in C++11 mode.
 
   Fixed in https://github.com/google/protobuf/pull/1549
+
+- 0012-extract-globals.patch
+
+  Fixes https://crbug.com/700120.  Moves everything that would have
+  gotten linked into .data or .bss sections into globals.cc so that
+  Chromium may build a shared library containing just protobuf
+  globals.  Also prefixes every symbol with 'cr_' to avoid conflicting
+  with symbols from the system protobuf.