Move Android SkFontMgr::Factory to its own file.

src/ports/SkFontMgr_android_factory.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkFontMgr.h"
+#include "SkFontMgr_android.h"
+
+// For test only.
+static const char* gTestFontsXml = NULL;
+static const char* gTestFallbackFontsXml = NULL;
+static const char* gTestBasePath = NULL;
+
+void SkUseTestFontConfigFile(const char* fontsXml, const char* fallbackFontsXml,
+                             const char* basePath)
+{
+    gTestFontsXml = fontsXml;
+    gTestFallbackFontsXml = fallbackFontsXml;
+    gTestBasePath = basePath;
+    SkASSERT(gTestFontsXml);
+    SkASSERT(gTestFallbackFontsXml);
+    SkASSERT(gTestBasePath);
+    SkDEBUGF(("Test BasePath: %s Fonts: %s FallbackFonts: %s\n",
+              gTestBasePath, gTestFontsXml, gTestFallbackFontsXml));
+}
+
+SkFontMgr* SkFontMgr::Factory() {
+    // These globals exist so that Chromium can override the environment.
+    // TODO: these globals need to be removed, and Chromium use SkFontMgr_New_Android instead.
+    if ((gTestFontsXml || gTestFallbackFontsXml) && gTestBasePath) {
+        SkFontMgr_Android_CustomFonts custom = {
+            SkFontMgr_Android_CustomFonts::kOnlyCustom,
+            gTestBasePath,
+            gTestFontsXml,
+            gTestFallbackFontsXml
+        };
+        return SkFontMgr_New_Android(&custom);
+    }
+
+    return SkFontMgr_New_Android(NULL);
+}