Introducing 2 usages for SwiftShader

ui/gl/init/gl_factory_x11.cc

Index: ui/gl/init/gl_factory_x11.cc
diff --git a/ui/gl/init/gl_factory_x11.cc b/ui/gl/init/gl_factory_x11.cc
index 0b7fc2db01450291dc8808702ddd7d77f2ae636b..38a4d2210d6e193d4ff6b40952fa54f09335c748 100644
--- a/ui/gl/init/gl_factory_x11.cc
+++ b/ui/gl/init/gl_factory_x11.cc
@@ -31,6 +31,7 @@ std::vector<GLImplementation> GetAllowedGLImplementations() {
   impls.push_back(kGLImplementationDesktopGL);
   impls.push_back(kGLImplementationEGLGLES2);
   impls.push_back(kGLImplementationOSMesaGL);
+  impls.push_back(kGLImplementationSwiftShaderGL);
   return impls;
 }
 
@@ -56,6 +57,7 @@ scoped_refptr<GLContext> CreateGLContext(GLShareGroup* share_group,
     case kGLImplementationDesktopGL:
       return InitializeGLContext(new GLContextGLX(share_group),
                                  compatible_surface, attribs);
+    case kGLImplementationSwiftShaderGL:
     case kGLImplementationEGLGLES2:
       return InitializeGLContext(new GLContextEGL(share_group),
                                  compatible_surface, attribs);
@@ -80,6 +82,7 @@ scoped_refptr<GLSurface> CreateViewGLSurface(gfx::AcceleratedWidget window) {
       return InitializeGLSurface(new GLSurfaceOSMesaX11(window));
     case kGLImplementationDesktopGL:
       return InitializeGLSurface(new GLSurfaceGLXX11(window));
+    case kGLImplementationSwiftShaderGL:
     case kGLImplementationEGLGLES2:
       DCHECK(window != gfx::kNullAcceleratedWidget);
       return InitializeGLSurface(new NativeViewGLSurfaceEGLX11(window));
@@ -103,6 +106,7 @@ scoped_refptr<GLSurface> CreateOffscreenGLSurfaceWithFormat(
     case kGLImplementationDesktopGL:
       return InitializeGLSurfaceWithFormat(
           new UnmappedNativeViewGLSurfaceGLX(size), format);
+    case kGLImplementationSwiftShaderGL:
     case kGLImplementationEGLGLES2:
       return InitializeGLSurfaceWithFormat(
           new PbufferGLSurfaceEGL(size), format);