Revert 98230 - CL removing inheritance of SkDevice from PlatformDevice.

skia/ext/platform_device_linux.cc

Index: skia/ext/platform_device_linux.cc
===================================================================
--- skia/ext/platform_device_linux.cc	(revision 98232)
+++ skia/ext/platform_device_linux.cc	(working copy)
@@ -6,12 +6,23 @@
 
 namespace skia {
 
-PlatformSurface PlatformDevice::BeginPlatformPaint() {
-  return NULL;
+PlatformDevice::PlatformDevice(const SkBitmap& bitmap)
+    : SkDevice(bitmap) {
+  SetPlatformDevice(this, this);
 }
 
+bool PlatformDevice::IsNativeFontRenderingAllowed() {
+  return true;
+}
+
 void PlatformDevice::EndPlatformPaint() {
   // We don't need to do anything on Linux here.
 }
 
+void PlatformDevice::DrawToNativeContext(PlatformSurface surface, int x, int y,
+                                         const PlatformRect* src_rect) {
+  // Should never be called on Linux.
+  SkASSERT(false);
+}
+
 }  // namespace skia