Revert of Revert of Rename kPMColor_SkColorType to kN32_SkColorType. (https://codereview.chromium.org/234243002/)

Reason for revert:
Want to reland the original CL.

Original issue's description:
> Revert of Rename kPMColor_SkColorType to kN32_SkColorType. (https://codereview.chromium.org/227433009/)
>
> Reason for revert:
> breaking the Chrome deps roll.
> http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20%28dbg%29/builds/839/steps/compile/logs/stdio
>
> Original issue's description:
> > Rename kPMColor_SkColorType to kN32_SkColorType.
> >
> > The new name better represents what this flag means.
> >
> > BUG=skia:2384
> >
> > Committed: http://code.google.com/p/skia/source/detail?r=14117
>
> TBR=reed@google.com,scroggo@google.com
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:2384
>
> Committed: http://code.google.com/p/skia/source/detail?r=14144

R=reed@google.com, bensong@google.com
TBR=bensong@google.com, reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2384

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/235523003

git-svn-id: http://skia.googlecode.com/svn/trunk@14156 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/skdiff_utils.cpp b/tools/skdiff_utils.cpp
index 2f05239..5ca3d80 100644
--- a/tools/skdiff_utils.cpp
+++ b/tools/skdiff_utils.cpp
@@ -85,7 +85,7 @@
 
 bool write_bitmap(const SkString& path, const SkBitmap& bitmap) {
     SkBitmap copy;
-    bitmap.copyTo(&copy, kPMColor_SkColorType);
+    bitmap.copyTo(&copy, kN32_SkColorType);
     force_all_opaque(copy);
     return SkImageEncoder::EncodeFile(path.c_str(), copy,
                                       SkImageEncoder::kPNG_Type, 100);
diff --git a/tools/skimage_main.cpp b/tools/skimage_main.cpp
index 5e5953e..e5610ea 100644
--- a/tools/skimage_main.cpp
+++ b/tools/skimage_main.cpp
@@ -164,7 +164,7 @@
         return true;
     }
 
-    if (bm.colorType() == kPMColor_SkColorType) {
+    if (bm.colorType() == kN32_SkColorType) {
         // First attempt at encoding failed, and the bitmap was already 8888. Making
         // a copy is not going to help.
         return false;
@@ -172,7 +172,7 @@
 
     // Encoding failed. Copy to 8888 and try again.
     SkBitmap bm8888;
-    if (!bm.copyTo(&bm8888, kPMColor_SkColorType)) {
+    if (!bm.copyTo(&bm8888, kN32_SkColorType)) {
         return false;
     }
     return SkImageEncoder::EncodeFile(filename.c_str(), bm8888, SkImageEncoder::kPNG_Type, 100);
diff --git a/tools/skpdiff/SkDiffContext.cpp b/tools/skpdiff/SkDiffContext.cpp
index b9c55c1..6f0b09f 100644
--- a/tools/skpdiff/SkDiffContext.cpp
+++ b/tools/skpdiff/SkDiffContext.cpp
@@ -122,7 +122,7 @@
 
             // compute the image diff and output it
             SkBitmap copy;
-            diffData.fResult.poiAlphaMask.copyTo(&copy, kPMColor_SkColorType);
+            diffData.fResult.poiAlphaMask.copyTo(&copy, kN32_SkColorType);
             SkImageEncoder::EncodeFile(newRecord->fDifferencePath.c_str(), copy,
                                        SkImageEncoder::kPNG_Type, 100);
 
diff --git a/tools/skpdiff/SkPMetric.cpp b/tools/skpdiff/SkPMetric.cpp
index ed80763..beba497 100644
--- a/tools/skpdiff/SkPMetric.cpp
+++ b/tools/skpdiff/SkPMetric.cpp
@@ -125,8 +125,8 @@
 /// Converts a 8888 bitmap to LAB color space and puts it into the output
 static bool bitmap_to_cielab(const SkBitmap* bitmap, ImageLAB* outImageLAB) {
     SkBitmap bm8888;
-    if (bitmap->colorType() != kPMColor_SkColorType) {
-        if (!bitmap->copyTo(&bm8888, kPMColor_SkColorType)) {
+    if (bitmap->colorType() != kN32_SkColorType) {
+        if (!bitmap->copyTo(&bm8888, kN32_SkColorType)) {
             return false;
         }
         bitmap = &bm8888;