Remove dependency on src/android from dm and nanobench

BUG=skia:

Review URL: https://codereview.chromium.org/1443033002
diff --git a/bench/BitmapRegionDecoderBench.cpp b/bench/BitmapRegionDecoderBench.cpp
index a98dbb0..125c4a8 100644
--- a/bench/BitmapRegionDecoderBench.cpp
+++ b/bench/BitmapRegionDecoderBench.cpp
@@ -8,7 +8,6 @@
 #include "BitmapRegionDecoderBench.h"
 #include "CodecBenchPriv.h"
 #include "SkBitmap.h"
-#include "SkBitmapRegionDecoderPriv.h"
 #include "SkOSFile.h"
 
 BitmapRegionDecoderBench::BitmapRegionDecoderBench(const char* baseName, SkData* encoded,
@@ -41,7 +40,7 @@
 
     fName.printf("BRD_%s_%s_%s", baseName, strategyName, colorName);
     if (1 != sampleSize) {
-        fName.appendf("_%.3f", get_scale_from_sample_size(sampleSize));
+        fName.appendf("_%.3f", 1.0f / (float) sampleSize);
     }
 }
 
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 2587b0d..403252b 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -12,7 +12,6 @@
 #include "OverwriteLine.h"
 #include "ProcStats.h"
 #include "SkBBHFactory.h"
-#include "SkBitmapRegionDecoderPriv.h"
 #include "SkChecksum.h"
 #include "SkCodec.h"
 #include "SkCommonFlags.h"
@@ -285,7 +284,7 @@
     }
 
     if (1 != sampleSize) {
-        folder.appendf("_%.3f", get_scale_from_sample_size(sampleSize));
+        folder.appendf("_%.3f", 1.0f / (float) sampleSize);
     }
 
     AndroidCodecSrc* src = new AndroidCodecSrc(path, mode, dstColorType, sampleSize);
@@ -441,7 +440,7 @@
     }
 
     if (1 != sampleSize) {
-        folder.appendf("_%.3f", get_scale_from_sample_size(sampleSize));
+        folder.appendf("_%.3f", 1.0f / (float) sampleSize);
     }
 
     BRDSrc* src = new BRDSrc(path, strategy, mode, dstColorType, sampleSize);
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index c9178c0..75f954f 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -8,7 +8,6 @@
 #include "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkAndroidCodec.h"
-#include "SkBitmapRegionDecoderPriv.h"
 #include "SkCodec.h"
 #include "SkCommonFlags.h"
 #include "SkData.h"
@@ -228,7 +227,7 @@
     if (1 == fSampleSize) {
         return SkOSPath::Basename(fPath.c_str());
     }
-    return get_scaled_name(fPath, get_scale_from_sample_size(fSampleSize));
+    return get_scaled_name(fPath, 1.0f / (float) fSampleSize);
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
@@ -761,7 +760,7 @@
     if (1 == fSampleSize) {
         return SkOSPath::Basename(fPath.c_str());
     }
-    return get_scaled_name(fPath, get_scale_from_sample_size(fSampleSize));
+    return get_scaled_name(fPath, 1.0f / (float) fSampleSize);
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
diff --git a/gyp/bench.gypi b/gyp/bench.gypi
index ae00e0c..825ea4f 100644
--- a/gyp/bench.gypi
+++ b/gyp/bench.gypi
@@ -7,7 +7,6 @@
     '../bench/subset',
     '../bench',
     '../include/private',
-    '../src/android',
     '../src/core',
     '../src/effects',
     '../src/gpu',
diff --git a/gyp/dm.gypi b/gyp/dm.gypi
index 2ff2093..96bd385 100644
--- a/gyp/dm.gypi
+++ b/gyp/dm.gypi
@@ -8,7 +8,6 @@
     '../dm',
     '../gm',
     '../include/private',
-    '../src/android',
     '../src/core',
     '../src/effects',
     '../src/images',
diff --git a/gyp/visualbench.gyp b/gyp/visualbench.gyp
index 2d23830..aac107b 100644
--- a/gyp/visualbench.gyp
+++ b/gyp/visualbench.gyp
@@ -18,7 +18,6 @@
         '../bench',
         '../include/gpu',
         '../include/private',
-        '../src/android',
         '../src/core',
         '../src/effects',
         '../src/images',
diff --git a/src/android/SkBitmapRegionDecoderPriv.h b/src/android/SkBitmapRegionDecoderPriv.h
index d7423b0..baa891e 100644
--- a/src/android/SkBitmapRegionDecoderPriv.h
+++ b/src/android/SkBitmapRegionDecoderPriv.h
@@ -8,10 +8,6 @@
 #ifndef SkBitmapRegionDecoderPriv_DEFINED
 #define SkBitmapRegionDecoderPriv_DEFINED
 
-inline float get_scale_from_sample_size(uint32_t sampleSize) {
-    return 1.0f / (float) sampleSize;
-}
-
 enum SubsetType {
     kFullyInside_SubsetType,
     kPartiallyInside_SubsetType,