Roll breakpad r1387 -> r1388 for breakpad microdumps.

This picks up the microdump refactoring and updates the gyp/gn
makefiles accordingly.

SVN changes picked up by  this roll:
r1388: Microdumps: refactor out common parts of minidump_writer.cc

BUG=410294

Review URL: https://codereview.chromium.org/602403002

Cr-Commit-Position: refs/heads/master@{#297635}

DEPS

@@ -100,7 +100,7 @@ allowed_hosts = [
 
 deps = {
   'src/breakpad/src':
-   Var('chromium_git') + '/external/google-breakpad/src.git' + '@' + '35189355da4b65ed5e7692f790c240a9ab347731', # from svn revision 1387
+   Var('chromium_git') + '/external/google-breakpad/src.git' + '@' + 'e15ba2c4d7d3b10c8c2818aa14ab66ad9a383ff6', # from svn revision 1388
 
   'src/buildtools':
    Var('chromium_git') + '/chromium/buildtools.git' + '@' +  Var('buildtools_revision'),

breakpad/BUILD.gn

@@ -399,6 +399,13 @@ if (is_linux || is_android) {
     sources = [
       "src/client/linux/crash_generation/crash_generation_client.cc",
       "src/client/linux/crash_generation/crash_generation_client.h",
+      "src/client/linux/dump_writer_common/mapping_info.h",
+      "src/client/linux/dump_writer_common/seccomp_unwinder.cc",
+      "src/client/linux/dump_writer_common/seccomp_unwinder.h",
+      "src/client/linux/dump_writer_common/thread_info.cc",
+      "src/client/linux/dump_writer_common/thread_info.h",
+      "src/client/linux/dump_writer_common/ucontext_reader.cc",
+      "src/client/linux/dump_writer_common/ucontext_reader.h",
       "src/client/linux/handler/exception_handler.cc",
       "src/client/linux/handler/exception_handler.h",
       "src/client/linux/handler/minidump_descriptor.cc",

breakpad/breakpad.gyp

@@ -463,6 +463,13 @@
             'src/client/linux/handler/minidump_descriptor.h',
             'src/client/linux/log/log.cc',
             'src/client/linux/log/log.h',
+            'src/client/linux/dump_writer_common/mapping_info.h',
+            'src/client/linux/dump_writer_common/seccomp_unwinder.cc',
+            'src/client/linux/dump_writer_common/seccomp_unwinder.h',
+            'src/client/linux/dump_writer_common/thread_info.cc',
+            'src/client/linux/dump_writer_common/thread_info.h',
+            'src/client/linux/dump_writer_common/ucontext_reader.cc',
+            'src/client/linux/dump_writer_common/ucontext_reader.h',
             'src/client/linux/minidump_writer/cpu_set.h',
             'src/client/linux/minidump_writer/directory_reader.h',
             'src/client/linux/minidump_writer/line_reader.h',