Fix missing headers in brotli

Decreased the number of missing header files by 4.

BUG=661774

Review-Url: https://codereview.chromium.org/2854603002
Cr-Commit-Position: refs/heads/master@{#468319}

.gn

@@ -141,6 +141,7 @@ check_targets = [
   "//testing/*",
 
   #"//third_party/*",  # May not ever want this.
+  "//third_party/brotli/*",
   "//third_party/hunspell/*",
   "//third_party/libaddressinput/*",
   "//third_party/libphonenumber/*",

third_party/brotli/BUILD.gn

@@ -12,6 +12,15 @@ config("includes") {
   include_dirs = [ "include" ]
 }
 
+source_set("headers") {
+  sources = [
+    "include/brotli/decode.h",
+    "include/brotli/encode.h",
+    "include/brotli/port.h",
+    "include/brotli/types.h",
+  ]
+}
+
 static_library("common") {
   sources = [
     "common/constants.h",
@@ -20,6 +29,9 @@ static_library("common") {
     "common/version.h",
   ]
   public_configs = [ ":includes" ]
+  deps = [
+    ":headers",
+  ]
 }
 
 static_library("dec") {
@@ -38,6 +50,10 @@ static_library("dec") {
   ]
   public_configs = [ ":includes" ]
 
+  public_deps = [
+    ":headers",
+  ]
+
   deps = [
     ":common",
   ]
@@ -113,6 +129,7 @@ if (current_toolchain == host_toolchain) {
     deps = [
       ":common",
       ":dec",
+      ":headers",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
     ]