Image filters: Replace all use of tryAllocPixels() with createDevice().

src/effects/SkMagnifierImageFilter.cpp

Index: src/effects/SkMagnifierImageFilter.cpp
diff --git a/src/effects/SkMagnifierImageFilter.cpp b/src/effects/SkMagnifierImageFilter.cpp
index 9138c867b56e0d94749e7493e917e21499613b21..903f34ca147cd76fa428d4ced96f9afc383e0fb2 100644
--- a/src/effects/SkMagnifierImageFilter.cpp
+++ b/src/effects/SkMagnifierImageFilter.cpp
@@ -8,6 +8,7 @@
 #include "SkBitmap.h"
 #include "SkMagnifierImageFilter.h"
 #include "SkColorPriv.h"
+#include "SkDevice.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkValidationUtils.h"
@@ -300,7 +301,7 @@ void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
     buffer.writeScalar(fInset);
 }
 
-bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src,
+bool SkMagnifierImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
                                            const Context&, SkBitmap* dst,
                                            SkIPoint* offset) const {
     if ((src.colorType() != kN32_SkColorType) ||
@@ -315,9 +316,12 @@ bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src,
       return false;
     }
 
-    if (!dst->tryAllocPixels(src.info())) {
+    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(src.width(), src.height()));
+    if (!device) {
         return false;
     }
+    *dst = device->accessBitmap(false);
+    SkAutoLockPixels alp_dst(*dst);
 
     SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;