Add compiler and linker flags for MIPS.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index c61964fc86db552551b3dda4a440cdc891427f0a..890a56eb88ade3474f1e7a34dc10e65d39d4f573 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -6,6 +6,9 @@ import("//build/config/android/config.gni")
 if (cpu_arch == "arm") {
   import("//build/config/arm.gni")
 }
+if (cpu_arch == "mipsel" || cpu_arch == "mips64el") {
+  import("//build/config/mips.gni")
+}
 if (is_posix) {
   import("//build/config/gcc/gcc_version.gni")
 }
@@ -272,6 +275,51 @@ config("compiler") {
           ]
         }
       }
+    } else if (cpu_arch == "mipsel") {
+      # Don't set the compiler flags for the WebView build. These will come
+      # from the Android build system.
+      if (!is_android_webview_build) {
+        if (mips_arch_variant == "r6") {
+          cflags += [
+            "-mips32r6",
+            "-Wa,-mips32r6",
+          ]
+          if (is_android) {
+            ldflags += [
+              "-mips32r6",
+              "-Wl,-melf32ltsmip",
+            ]
+          }
+        } else if (mips_arch_variant == "r2") {
+          cflags += [
+            "-mips32r2",
+            "-Wa,-mips32r2",
+          ]
+        } else if (mips_arch_variant == "r1") {
+          cflags += [
+            "-mips32",
+            "-Wa,-mips32",
+          ]
+        }
+      }
+    } else if (cpu_arch == "mips64el") {
+      # Don't set the compiler flags for the WebView build. These will come
+      # from the Android build system.
+      if (!is_android_webview_build) {
+        if (mips_arch_variant == "r6") {
+          cflags += [
+            "-mips64r6",
+            "-Wa,-mips64r6",
+          ]
+          ldflags += [ "-mips64r6" ]
+        } else if (mips_arch_variant == "r2") {
+          cflags += [
+            "-mips64r2",
+            "-Wa,-mips64r2",
+          ]
+          ldflags += [ "-mips64r2" ]
+        }
+      }
     }
 
     defines += [ "_FILE_OFFSET_BITS=64" ]