Merge latest Skia into master (3 commits)

https://skia.googlesource.com/skia.git/+log/0831f1b..874a872

Test: Presubmit checks will test this change.
Change-Id: I72ab252fe17218f7841c79dc1c50a201ec1d34f9
diff --git a/gm/savelayer.cpp b/gm/savelayer.cpp
index 9b4db35..8f2d5c8 100644
--- a/gm/savelayer.cpp
+++ b/gm/savelayer.cpp
@@ -7,17 +7,20 @@
 
 #include "gm.h"
 
-static void saveLayer(SkCanvas* canvas, SkScalar l, SkScalar t, SkScalar r, SkScalar b) {
-    uint32_t flag = 1U << 31;
+// This GM tests out the deprecated Android-specific unclipped saveLayer "feature".
+// In particular, it attempts to compare the performance of unclipped saveLayers with alternatives.
+
+static void save_layer_unclipped(SkCanvas* canvas,
+                                 SkScalar l, SkScalar t, SkScalar r, SkScalar b) {
+    static const uint32_t kSecretDeprecated_DontClipToLayerFlag = 1U << 31;
     SkRect rect = SkRect::MakeLTRB(l, t, r, b);
-    canvas->saveLayer({ &rect, nullptr, nullptr, flag });
+    canvas->saveLayer({ &rect, nullptr, nullptr, kSecretDeprecated_DontClipToLayerFlag });
 }
 
 static void do_draw(SkCanvas* canvas) {
     SkPaint paint;
     SkRandom rand;
 
-    SkAutoCanvasRestore acr(canvas, true);
     for (int i = 0; i < 20; ++i) {
         paint.setColor(rand.nextU() | (0xFF << 24));
         canvas->drawRect({ 15, 15, 290, 40 }, paint);
@@ -25,18 +28,60 @@
     }
 }
 
-DEF_SIMPLE_GM(savelayer_unclipped, canvas, 320, 640) {
-    const SkScalar L = 10;
-    const SkScalar T = 10;
-    const SkScalar R = 310;
-    const SkScalar B = 630;
+class UnclippedSaveLayerGM : public skiagm::GM {
+public:
+    enum class Mode {
+        kClipped,
+        kUnclipped
+    };
 
-    canvas->clipRect({ L, T, R, B });
+    UnclippedSaveLayerGM(Mode mode) : fMode(mode) { this->setBGColor(SK_ColorWHITE); }
 
-    for (int i = 0; i < 100; ++i) {
-        SkAutoCanvasRestore acr(canvas, true);
-        saveLayer(canvas, L, T, R, T + 20);
-        saveLayer(canvas, L, B - 20, R, B);
-        do_draw(canvas);
+protected:
+    bool runAsBench() const override { return true; }
+
+    SkString onShortName() override {
+        if (Mode::kClipped == fMode) {
+            return SkString("savelayer_unclipped");
+        } else {
+            SkASSERT(Mode::kUnclipped == fMode);
+            return SkString("savelayer_clipped");
+        }
     }
-}
+
+    SkISize onISize() override { return SkISize::Make(320, 640); }
+
+    void onDraw(SkCanvas* canvas) override {
+        const SkScalar L = 10;
+        const SkScalar T = 10;
+        const SkScalar R = 310;
+        const SkScalar B = 630;
+
+        canvas->clipRect({ L, T, R, B });
+
+        for (int i = 0; i < 100; ++i) {
+            SkAutoCanvasRestore acr(canvas, true);
+            if (Mode::kClipped == fMode) {
+                save_layer_unclipped(canvas, L, T, R, T + 20);
+                save_layer_unclipped(canvas, L, B - 20, R, B);
+            } else {
+                SkASSERT(Mode::kUnclipped == fMode);
+                canvas->saveLayer({ L, T, R, B }, nullptr);
+            } 
+
+            do_draw(canvas);
+        }
+    }
+
+private:
+    Mode fMode;
+
+    typedef skiagm::GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM(return new UnclippedSaveLayerGM(UnclippedSaveLayerGM::Mode::kClipped);)
+DEF_GM(return new UnclippedSaveLayerGM(UnclippedSaveLayerGM::Mode::kUnclipped);)
+
+
diff --git a/src/core/SkAnalyticEdge.h b/src/core/SkAnalyticEdge.h
index c70772d..e2a9867 100644
--- a/src/core/SkAnalyticEdge.h
+++ b/src/core/SkAnalyticEdge.h
@@ -10,6 +10,11 @@
 
 #include "SkEdge.h"
 
+// Use this to check that we successfully guard the change against Chromium layout tests
+#ifndef  SK_SUPPORT_LEGACY_AAA
+# define SK_SUPPORT_LEGACY_AAA
+#endif
+
 struct SkAnalyticEdge {
     // Similar to SkEdge, the conic edges will be converted to quadratic edges
     enum Type {
diff --git a/src/core/SkImageInfoPriv.h b/src/core/SkImageInfoPriv.h
index 72138ae..2b09a4e 100644
--- a/src/core/SkImageInfoPriv.h
+++ b/src/core/SkImageInfoPriv.h
@@ -51,6 +51,8 @@
  *      should we use kPremul or kUnpremul color values with the opaque alphas?  Or should
  *      we just use whatever the |src| alpha is?  In the future, we could choose to clearly
  *      define this, but currently no one is asking for this feature.
+ *      We will not convert to a particular color space if |src| is nullptr.  The color space
+ *      conversion is not well-defined.
  */
 static inline bool SkImageInfoValidConversion(const SkImageInfo& dst, const SkImageInfo& src) {
     if (!SkImageInfoIsValid(dst) || !SkImageInfoIsValid(src)) {
@@ -73,5 +75,9 @@
         return false;
     }
 
+    if (dst.colorSpace() && !src.colorSpace()) {
+        return false;
+    }
+
     return true;
 }
diff --git a/src/core/SkScan.h b/src/core/SkScan.h
index c995542..d0c10fa 100644
--- a/src/core/SkScan.h
+++ b/src/core/SkScan.h
@@ -23,6 +23,11 @@
 */
 typedef SkIRect SkXRect;
 
+// Use this to check that we successfully guard the change against Chromium layout tests
+#ifndef  SK_SUPPORT_LEGACY_AAA
+# define SK_SUPPORT_LEGACY_AAA
+#endif
+
 extern std::atomic<bool> gSkUseAnalyticAA;
 extern std::atomic<bool> gSkForceAnalyticAA;
 
diff --git a/tests/ImageTest.cpp b/tests/ImageTest.cpp
index 4f9d944..904ca20 100644
--- a/tests/ImageTest.cpp
+++ b/tests/ImageTest.cpp
@@ -34,6 +34,14 @@
 
 using namespace sk_gpu_test;
 
+SkImageInfo read_pixels_info(SkImage* image) {
+    if (as_IB(image)->onImageInfo().colorSpace()) {
+        return SkImageInfo::MakeS32(image->width(), image->height(), image->alphaType());
+    }
+
+    return SkImageInfo::MakeN32(image->width(), image->height(), image->alphaType());
+}
+
 static void assert_equal(skiatest::Reporter* reporter, SkImage* a, const SkIRect* subsetA,
                          SkImage* b) {
     const int widthA = subsetA ? subsetA->width() : a->width();
@@ -45,11 +53,9 @@
     // see https://bug.skia.org/3965
     //REPORTER_ASSERT(reporter, a->isOpaque() == b->isOpaque());
 
-    // The codecs may have given us back F16, we can't read from F16 raster to N32, only S32.
-    SkImageInfo info = SkImageInfo::MakeS32(widthA, heightA, a->alphaType());
     SkAutoPixmapStorage pmapA, pmapB;
-    pmapA.alloc(info);
-    pmapB.alloc(info);
+    pmapA.alloc(read_pixels_info(a));
+    pmapB.alloc(read_pixels_info(b));
 
     const int srcX = subsetA ? subsetA->x() : 0;
     const int srcY = subsetA ? subsetA->y() : 0;
@@ -57,7 +63,7 @@
     REPORTER_ASSERT(reporter, a->readPixels(pmapA, srcX, srcY));
     REPORTER_ASSERT(reporter, b->readPixels(pmapB, 0, 0));
 
-    const size_t widthBytes = widthA * info.bytesPerPixel();
+    const size_t widthBytes = widthA * 4;
     for (int y = 0; y < heightA; ++y) {
         REPORTER_ASSERT(reporter, !memcmp(pmapA.addr32(0, y), pmapB.addr32(0, y), widthBytes));
     }