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diff --git a/externals/breakpad/src/common/windows/symbol_collector_client.h b/externals/breakpad/src/common/windows/symbol_collector_client.h
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+++ b/externals/breakpad/src/common/windows/symbol_collector_client.h
@@ -0,0 +1,92 @@
+// Copyright 2019 Google LLC
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef COMMON_WINDOWS_SYMBOL_COLLECTOR_CLIENT_H_
+#define COMMON_WINDOWS_SYMBOL_COLLECTOR_CLIENT_H_
+
+#include <string>
+
+namespace google_breakpad {
+
+  using std::wstring;
+
+  struct UploadUrlResponse {
+    // URL at which to HTTP PUT symbol file.
+    wstring upload_url;
+    // Unique key used to complete upload of symbol file.
+    wstring upload_key;
+  };
+
+  enum SymbolStatus {
+    Found,
+    Missing,
+    Unknown
+  };
+
+  enum CompleteUploadResult {
+    Ok,
+    DuplicateData,
+    Error
+  };
+
+  // Client to interact with sym-upload-v2 API server via HTTP/REST.
+  class SymbolCollectorClient {
+  public:
+    // Returns a URL at which a symbol file can be HTTP PUT without
+    // authentication, along with an upload key that can be used to
+    // complete the upload process with CompleteUpload.
+    static bool CreateUploadUrl(
+        wstring& api_url,
+        wstring& api_key,
+        int* timeout_ms,
+        UploadUrlResponse *uploadUrlResponse);
+
+    // Notify the API that symbol file upload is finished and its contents
+    // are ready to be read and/or used for further processing.
+    static CompleteUploadResult CompleteUpload(wstring& api_url,
+                                               wstring& api_key,
+                                               int* timeout_ms,
+                                               const wstring& upload_key,
+                                               const wstring& debug_file,
+                                               const wstring& debug_id,
+                                               const wstring& type,
+                                               const wstring& product_name);
+
+    // Returns whether or not a symbol file corresponding to the debug_file/
+    // debug_id pair is already present in symbol storage.
+    static SymbolStatus CheckSymbolStatus(
+        wstring& api_url,
+        wstring& api_key,
+        int* timeout_ms,
+        const wstring& debug_file,
+        const wstring& debug_id);
+  };
+
+}  // namespace google_breakpad
+
+#endif  // COMMON_WINDOWS_SYMBOL_COLLECTOR_CLIENT_H_