Re-land 714393002 after fixing android build.

sky/engine/public/platform/WebCommon.h

Index: sky/engine/public/platform/WebCommon.h
diff --git a/sky/engine/public/platform/WebCommon.h b/sky/engine/public/platform/WebCommon.h
index 9967267124fbc07fcac56c3c567b1ecb35c06b84..501f1d6cb77489cc165785c1cb3f87d018ddb2c0 100644
--- a/sky/engine/public/platform/WebCommon.h
+++ b/sky/engine/public/platform/WebCommon.h
@@ -44,27 +44,9 @@
 #endif
 
 #if defined(COMPONENT_BUILD)
-    #if defined(WIN32)
-        #if BLINK_IMPLEMENTATION
-            #define BLINK_EXPORT __declspec(dllexport)
-        #else // BLINK_IMPLEMENTATION
-            #define BLINK_EXPORT __declspec(dllimport)
-        #endif
-        #if BLINK_PLATFORM_IMPLEMENTATION
-            #define BLINK_PLATFORM_EXPORT __declspec(dllexport)
-        #else // BLINK_PLATFORM_IMPLEMENTATION
-            #define BLINK_PLATFORM_EXPORT __declspec(dllimport)
-        #endif
-        #if BLINK_COMMON_IMPLEMENTATION
-            #define BLINK_COMMON_EXPORT __declspec(dllexport)
-        #else // BLINK_COMMON_IMPLEMENTATION
-            #define BLINK_COMMON_EXPORT __declspec(dllimport)
-        #endif
-    #else // defined(WIN32)
-        #define BLINK_EXPORT __attribute__((visibility("default")))
-        #define BLINK_PLATFORM_EXPORT __attribute__((visibility("default")))
-        #define BLINK_COMMON_EXPORT __attribute__((visibility("default")))
-    #endif
+    #define BLINK_EXPORT __attribute__((visibility("default")))
+    #define BLINK_PLATFORM_EXPORT __attribute__((visibility("default")))
+    #define BLINK_COMMON_EXPORT __attribute__((visibility("default")))
 #else // defined(COMPONENT_BUILD)
     #define BLINK_EXPORT
     #define BLINK_PLATFORM_EXPORT
@@ -76,17 +58,7 @@
 // Basic types
 
 #include <stddef.h> // For size_t
-
-#if defined(WIN32)
-// Visual Studio doesn't have stdint.h.
-typedef short int16_t;
-typedef unsigned short uint16_t;
-typedef int int32_t;
-typedef unsigned int uint32_t;
-typedef unsigned __int64 uint64_t;
-#else
 #include <stdint.h> // For int32_t
-#endif
 
 namespace blink {
 
@@ -94,11 +66,7 @@ namespace blink {
 typedef int32_t WebUChar32;
 
 // UTF-16 character type
-#if defined(WIN32)
-typedef wchar_t WebUChar;
-#else
 typedef unsigned short WebUChar;
-#endif
 
 // Latin-1 character type
 typedef unsigned char WebLChar;