Fix ASAN errors in end2end tests.

2 minor issues of reading from uninitialized memory in tests.
Removes the suppressions from the fixed tests.

Bug: chromium:1029378
Change-Id: I466ce231cfed1ce53a60732706c05b778b096805
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2055649
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>

src/tests/gl_tests/ComputeShaderTest.cpp

@@ -637,10 +637,6 @@ TEST_P(ComputeShaderTest, DispatchComputeIndirect)
     // Flaky crash on teardown, see http://anglebug.com/3349
     ANGLE_SKIP_TEST_IF(IsD3D11() && IsIntel() && IsWindows());
 
-    // ASAN error on vulkan backend; ASAN tests only enabled on Mac Swangle
-    // (http://crbug.com/1029378)
-    ANGLE_SKIP_TEST_IF(IsOSX() && isSwiftshader());
-
     GLTexture texture;
     GLFramebuffer framebuffer;
     const char kCSSource[] = R"(#version 310 es
@@ -654,7 +650,7 @@ void main()
     ANGLE_GL_COMPUTE_PROGRAM(program, kCSSource);
     glUseProgram(program.get());
     const int kWidth = 4, kHeight = 6;
-    GLuint inputValues[] = {0};
+    GLuint inputValues[kWidth][kHeight] = {};
 
     GLBuffer buffer;
     glBindBuffer(GL_DISPATCH_INDIRECT_BUFFER, buffer);

src/tests/gl_tests/GLSLTest.cpp

@@ -3280,10 +3280,6 @@ TEST_P(GLSLTest_ES31, ArraysOfArraysSampler)
 // Test that structs containing arrays of samplers work as expected.
 TEST_P(GLSLTest_ES31, StructArraySampler)
 {
-    // ASAN error on vulkan backend; ASAN tests only enabled on Mac Swangle
-    // (http://crbug.com/1029378)
-    ANGLE_SKIP_TEST_IF(IsOSX() && isSwiftshader());
-
     constexpr char kFS[] =
         "#version 310 es\n"
         "precision mediump float;\n"
@@ -3299,13 +3295,14 @@ TEST_P(GLSLTest_ES31, StructArraySampler)
     glUseProgram(program.get());
     GLTexture textures[2];
     GLColor expected = MakeGLColor(32, 64, 96, 255);
+    GLubyte data[6]  = {};  // Two bytes of padding, so that texture can be initialized with 4 bytes
+    memcpy(data, expected.data(), sizeof(expected));
     for (int i = 0; i < 2; i++)
     {
         glActiveTexture(GL_TEXTURE0 + i);
         glBindTexture(GL_TEXTURE_2D, textures[i]);
         // Each element provides two components.
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
-                     expected.data() + 2 * i);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, data + 2 * i);
         std::stringstream uniformName;
         uniformName << "test.data[" << i << "]";
         // Then send it as a uniform