Revert of remvoe duplicate impl for SkImageInfo flattening

src/core/SkBitmapDevice.cpp

Index: src/core/SkBitmapDevice.cpp
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 368c8075112e6129b1e72c78d151536d76c68eef..1668618cf740bac454bd7af06774e5994d4443af 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -24,30 +24,31 @@
     , fBitmap(bitmap) {
 }
 
-void SkBitmapDevice::init(SkBitmap::Config config, int width, int height, bool isOpaque) {
+SkBitmapDevice::SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque) {
     fBitmap.setConfig(config, width, height, 0, isOpaque ?
                       kOpaque_SkAlphaType : kPremul_SkAlphaType);
-    
-    if (SkBitmap::kNo_Config != config) {
-        if (!fBitmap.allocPixels()) {
-            // indicate failure by zeroing our bitmap
-            fBitmap.setConfig(config, 0, 0, 0, isOpaque ?
-                              kOpaque_SkAlphaType : kPremul_SkAlphaType);
-        } else if (!isOpaque) {
-            fBitmap.eraseColor(SK_ColorTRANSPARENT);
-        }
-    }
-}
-
-SkBitmapDevice::SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque) {
-    this->init(config, width, height, isOpaque);
+    if (!fBitmap.allocPixels()) {
+        fBitmap.setConfig(config, 0, 0, 0, isOpaque ?
+                          kOpaque_SkAlphaType : kPremul_SkAlphaType);
+    }
+    if (!isOpaque) {
+        fBitmap.eraseColor(SK_ColorTRANSPARENT);
+    }
 }
 
 SkBitmapDevice::SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque,
                                const SkDeviceProperties& deviceProperties)
-    : SkBaseDevice(deviceProperties)
-{
-    this->init(config, width, height, isOpaque);
+    : SkBaseDevice(deviceProperties) {
+
+    fBitmap.setConfig(config, width, height, 0, isOpaque ?
+                      kOpaque_SkAlphaType : kPremul_SkAlphaType);
+    if (!fBitmap.allocPixels()) {
+        fBitmap.setConfig(config, 0, 0, 0, isOpaque ?
+                          kOpaque_SkAlphaType : kPremul_SkAlphaType);
+    }
+    if (!isOpaque) {
+        fBitmap.eraseColor(SK_ColorTRANSPARENT);
+    }
 }
 
 SkBitmapDevice::~SkBitmapDevice() {