Use brave-style user dir on linux

Brave support four different user dir depends on channel.
* Brave-Browser for stable release
* Brave-Browser-Beta for beta release
* Brave-Browser-Dev for dev release
* Brave-Development for unofficial build

Canary channel isn't supported on linux.

Channel suffixes are determined from $CHROME_VERSION_EXTRA, which is
passed by the launch wrapper script.
For more detail, see src/docs/user_data_dir.md#Linux

common/brave_channel_info_linux.cc

@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "brave/common/brave_channel_info_linux.h"
+
+namespace brave {
+
+std::string GetChannelSuffixForDataDir() {
+  std::string modifier;
+  std::string data_dir_suffix;
+
+  char* env = getenv("CHROME_VERSION_EXTRA");
+  if (env)
+    modifier = env;
+
+  // Chrome doesn't support canary channel on linux.
+  if (modifier == "unstable")  // linux version of "dev"
+    data_dir_suffix = "-Dev";
+  else if (modifier == "beta")
+    data_dir_suffix = "-Beta";
+
+  return data_dir_suffix;
+}
+
+}  // namespace brave

common/brave_channel_info_linux.h

@@ -0,0 +1,16 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef BRAVE_COMMON_BRAVE_CHANNEL_INFO_LINUX_H_
+#define BRAVE_COMMON_BRAVE_CHANNEL_INFO_LINUX_H_
+
+#include <string>
+
+namespace brave {
+
+std::string GetChannelSuffixForDataDir();
+
+}  // namespace brave
+
+#endif  // BRAVE_COMMON_BRAVE_CHANNEL_INFO_LINUX_H_

patches/chrome-common-BUILD.gn.patch

@@ -1,5 +1,5 @@
 diff --git a/chrome/common/BUILD.gn b/chrome/common/BUILD.gn
-index d08a945c6b11a918fa5faedcb1c87c269772e877..946a111464968bf780a4cf9ffad851c435b4e228 100644
+index d08a945c6b11a918fa5faedcb1c87c269772e877..7c1daac9f4ff71120ba2eab713e5aec1e24c4bf1 100644
 --- a/chrome/common/BUILD.gn
 +++ b/chrome/common/BUILD.gn
 @@ -528,6 +528,13 @@ static_library("non_code_constants") {
@@ -20,13 +20,13 @@ index d08a945c6b11a918fa5faedcb1c87c269772e877..946a111464968bf780a4cf9ffad851c4
      "pref_names.h",
    ]
 
-+  if (brave_chromium_build) {
-+    if (is_mac) {
-+      sources += [
-+        "//brave/common/brave_paths_mac.mm",
-+        "//brave/common/brave_paths_mac.h",
-+      ]
-+    }
++  if (brave_chromium_build && is_official_build) {
++    sources += [
++      "//brave/common/brave_paths_mac.mm",
++      "//brave/common/brave_paths_mac.h",
++      "//brave/common/brave_channel_info_linux.cc",
++      "//brave/common/brave_channel_info_linux.h",
++    ]
 +  }
 +
    public_deps = [

patches/chrome-common-chrome_paths_linux.cc.patch

@@ -1,16 +1,34 @@
 diff --git a/chrome/common/chrome_paths_linux.cc b/chrome/common/chrome_paths_linux.cc
-index fc47bd3f12418fdaed879e0b485bfc7cb572a6e8..b646812c6abafc22ffe62e06e46d818e15c80984 100644
+index fc47bd3f12418fdaed879e0b485bfc7cb572a6e8..9d7f74be49456b05c593ae2df4831c754d931a73 100644
 --- a/chrome/common/chrome_paths_linux.cc
 +++ b/chrome/common/chrome_paths_linux.cc
-@@ -89,8 +89,10 @@ bool GetDefaultUserDataDirectory(base::FilePath* result) {
+@@ -16,6 +16,10 @@
+ #include "chrome/common/channel_info.h"
+ #include "chrome/common/chrome_paths_internal.h"
 
++#if defined(BRAVE_CHROMIUM_BUILD) && defined(OFFICIAL_BUILD)
++#include "brave/common/brave_channel_info_linux.h"
++#endif
++
+ namespace chrome {
+
+ using base::nix::GetXDGDirectory;
+@@ -87,10 +91,18 @@ bool GetDefaultUserDataDirectory(base::FilePath* result) {
+         GetXDGDirectory(env.get(), kXdgConfigHomeEnvVar, kDotConfigDir);
+   }
+
++#if defined(BRAVE_CHROMIUM_BUILD)
++#if defined(OFFICIAL_BUILD)
++  *result = config_dir.Append("Brave-Browser" + brave::GetChannelSuffixForDataDir());
++#else
++  *result = config_dir.Append("Brave-Browser-Development");
++#endif
++#else
  #if defined(GOOGLE_CHROME_BUILD)
    *result = config_dir.Append("google-chrome" + GetChannelSuffixForDataDir());
-+#elif defined(OFFICIAL_BUILD)
-+  *result = config_dir.Append("brave-browser");
  #else
--  *result = config_dir.Append("chromium");
-+  *result = config_dir.Append("brave-browser-development");
+   *result = config_dir.Append("chromium");
++#endif
  #endif
    return true;
  }