Restore scratch texture reuse on Adreno.

New testing shows that it's a win on our slowest SKPs, and pretty much a
wash on faster tests (mixed results). However, it also saves us ~3 ms on
the hwui bitmap upload jank test.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2227983003

Review-Url: https://codereview.chromium.org/2227983003

src/gpu/gl/GrGLCaps.cpp

@@ -439,8 +439,7 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
     fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");
 
     // Disable scratch texture reuse on Mali and Adreno devices
-    fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor() &&
-                            kQualcomm_GrGLVendor != ctxInfo.vendor();
+    fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor();
 
 #if 0
     fReuseScratchBuffers = kARM_GrGLVendor != ctxInfo.vendor() &&