Extract ANGLE's symbols for Linux builds.

ANGLE's libGLESv2.so and libEGL.so have started shipping on Linux but
symbols were not available to help debug crashes.

BUG=988444

Change-Id: I89edc315c05cfe0dad785e386c643e44b56af72d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724491Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681869}

chrome/BUILD.gn

@@ -1983,6 +1983,34 @@ if (is_linux) {
         "//third_party/swiftshader/src/OpenGL/libGLESv2:swiftshader_libGLESv2",
       ]
     }
+    extract_symbols("angle_egl_symbols") {
+      binary = "$root_out_dir/libEGL.so"
+
+      if (current_cpu == "x86") {
+        # GYP used "ia32" so keep that naming for back-compat.
+        symbol_file = "$root_out_dir/angle_libegl.breakpad.ia32"
+      } else {
+        symbol_file = "$root_out_dir/angle_libegl.breakpad.$current_cpu"
+      }
+
+      deps = [
+        "//third_party/angle:libEGL",
+      ]
+    }
+    extract_symbols("angle_gles_symbols") {
+      binary = "$root_out_dir/libGLESv2.so"
+
+      if (current_cpu == "x86") {
+        # GYP used "ia32" so keep that naming for back-compat.
+        symbol_file = "$root_out_dir/angle_libgles.breakpad.ia32"
+      } else {
+        symbol_file = "$root_out_dir/angle_libgles.breakpad.$current_cpu"
+      }
+
+      deps = [
+        "//third_party/angle:libGLESv2",
+      ]
+    }
   }
 
   # Copies some scripts and resources that are used for desktop integration.

chrome/tools/build/linux/FILES.cfg

@@ -179,6 +179,18 @@ FILES = [
     'buildtype': ['official'],
     'archive': 'breakpad-info.zip',
   },
+  {
+    'filename': 'angle_libegl.breakpad.x64',
+    'arch': ['64bit'],
+    'buildtype': ['official'],
+    'archive': 'breakpad-info.zip',
+  },
+  {
+    'filename': 'angle_libgles.breakpad.x64',
+    'arch': ['64bit'],
+    'buildtype': ['official'],
+    'archive': 'breakpad-info.zip',
+  },
   {
     'filename': 'nacl_irt_x86_64.nexe.debug',
     'arch': ['64bit'],